<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-3880</journal-id>
<journal-title><![CDATA[Ciencias marinas]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. mar]]></abbrev-journal-title>
<issn>0185-3880</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-38802021000300185</article-id>
<article-id pub-id-type="doi">10.7773/cm.v47i3.3124</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Heavy metals in Venezuelan marine sediments: concentrations, degree of contamination, and distribution]]></article-title>
<article-title xml:lang="es"><![CDATA[Metales pesados en sedimentos marinos de Venezuela: concentraciones, grado de contaminación y distribución]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[Ruth]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Verde]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Elia M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Biología de Organismos Laboratorio de Comunidades Marinas]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Simón Bolívar Departamento de Estudios Ambientales Laboratorio de Ecología Experimental]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Simón Bolívar  ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>47</volume>
<numero>3</numero>
<fpage>185</fpage>
<lpage>199</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-38802021000300185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-38802021000300185&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-38802021000300185&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Venezuelan oil exploration and exploitation activities have been taking place since the 18th century. These long-term activities are closely related to heavy metal contamination because of the increasing input of toxic pollutants. Variations in heavy metal concentrations can cause, among other things, changes in metal distribution patterns, alterations in biogeochemical cycles, and increments in environmental and biological risks. The need for a complete baseline on heavy metal concentrations along the Venezuelan coast is critical. For this reason, we present the concentrations, distribution, and degree of contamination of 9 heavy metals (barium, mercury, copper, nickel, chromium, cadmium, zinc, lead, and vanadium) in marine sediments along the Venezuelan coast. We used the enrichment factor, the geoaccumulation index, and the mean effects range median quotients to evaluate the degree of contamination, comparing areas with and without intervention. Our results indicate that higher concentrations of these heavy metals are associated with places with greater anthropic activity, especially on the central and eastern coasts of Venezuela. Only cadmium showed extremely severe enrichment and a high degree of contamination. The biohazard potential was between 12% and 30% and was primarily associated with locations having high oil activity, which suggests that these places must be monitored, given the potential hazard they represent. This work encompasses the distribution and concentration of 9 heavy metals along the Venezuelan coast and takes relevance as a baseline for heavy metal concentrations and pollution indicators in marine sediments for Venezuela and the Caribbean.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Desde el siglo XVIII, en Venezuela, se han llevado a cabo actividades de exploración y explotación de hidrocarburos. Estas actividades de largo plazo han estado estrechamente relacionadas con la contaminación por metales pesados, debido a un incremento en la producción de sustancias contaminantes. Las variaciones en las concentraciones de estas sustancias pueden causar cambios en los patrones de distribución de metales, alteración de los ciclos biogeoquímicos e incremento en el riesgo biológico, entre otras cosas. Es imperante elaborar una línea base de metales pesados en la costa de Venezuela. En este trabajo se presentan las concentraciones, la distribución y el grado de contaminación de 9 metales pesados (bario, mercurio, cobre, níquel, cromo, cadmio, zinc, plomo y vanadio) en los sedimentos marinos de la costa de Venezuela. Se usó el factor de enriquecimiento, el índice de geoacumulación y los cocientes promedio del efecto de rango medio para evaluar el grado de contaminación y comparar áreas con y sin intervención. Nuestros resultados indican que las mayores concentraciones de metales pesados están asociados a lugares con mayor actividad antropogénica, principalmente en la costa central y la costa este de Venezuela. Solamente el cadmio mostró un severo enriquecimiento y un alto grado de contaminación. El potencial de riesgo biológico estuvo entre el 12% y el 30% y estuvo asociado principalmente a las instalaciones petroleras, lo que sugiere que estos lugares deben ser monitoreados debido al riesgo potencial que representan. Este trabajo abarca la concentración y la distribución de 9 metales pesados a lo largo de la costa venezolana y es relevante por ser una línea base de referencia de metales pesados e indicadores de contaminación en los sedimentos marinos de Venezuela y el Caribe.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[metals]]></kwd>
<kwd lng="en"><![CDATA[marine sediments]]></kwd>
<kwd lng="en"><![CDATA[intervened areas]]></kwd>
<kwd lng="en"><![CDATA[pollution indicators]]></kwd>
<kwd lng="en"><![CDATA[Venezuela]]></kwd>
<kwd lng="es"><![CDATA[metales]]></kwd>
<kwd lng="es"><![CDATA[sedimentos marinos]]></kwd>
<kwd lng="es"><![CDATA[áreas intervenidas]]></kwd>
<kwd lng="es"><![CDATA[indicadores de contaminación]]></kwd>
<kwd lng="es"><![CDATA[Venezuela]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Abrahim]]></surname>
<given-names><![CDATA[GMS]]></given-names>
</name>
<name>
<surname><![CDATA[Parker]]></surname>
<given-names><![CDATA[RJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Assessment of heavy metal enrichment factors and the degree of contamination in marine sediments from Tamaki Estuary, Auckland, New Zealand]]></article-title>
<source><![CDATA[Environ Monit Assess]]></source>
<year>2008</year>
<volume>136</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>227-38</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Birch]]></surname>
<given-names><![CDATA[GF]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Determination of sediment metal background concentrations and enrichment in marine environments-a critical review]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2017</year>
<volume>580</volume>
<page-range>813-31</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Birch]]></surname>
<given-names><![CDATA[GF]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[An assessment of aluminum and iron in normalisation and enrichment procedures for environmental assessment of marine sediment]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2020</year>
<volume>727</volume>
<page-range>138123</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Birth]]></surname>
<given-names><![CDATA[GA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A scheme for assessing human impacts on coastal aquatic environments using sediments]]></article-title>
<source><![CDATA[Coastal Gis]]></source>
<year>2003</year>
<publisher-loc><![CDATA[Australia ]]></publisher-loc>
<publisher-name><![CDATA[[University of Wollongong]]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bone]]></surname>
</name>
</person-group>
<source><![CDATA[Estudio de la actualización de la línea base biológica de los ambientes marinos-costeros y caño Alpargaton de Golfo Triste]]></source>
<year>2012</year>
<page-range>322</page-range><publisher-loc><![CDATA[Venezuela ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Simón Bolivar, Instituto de Tecnología y Ciencias Marinas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Boyd]]></surname>
<given-names><![CDATA[PW]]></given-names>
</name>
<name>
<surname><![CDATA[Ellwood]]></surname>
<given-names><![CDATA[MJ]]></given-names>
</name>
<name>
<surname><![CDATA[Tagliabue]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Twining]]></surname>
<given-names><![CDATA[BS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Biotic and abiotic retention, recycling and remineralization of metals in the ocean]]></article-title>
<source><![CDATA[Nat Geosci]]></source>
<year>2017</year>
<volume>10</volume>
<page-range>167-73</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Braune]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Chételat]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Amyot]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Brown]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Clayden]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Evans]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Fisk]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Gaden]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Girard]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Hare]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Mercury in the marine environment of the Canadian Arctic: Review of recent findings]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2015</year>
<volume>509</volume>
<page-range>67-90</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Buchman]]></surname>
<given-names><![CDATA[MF]]></given-names>
</name>
</person-group>
<source><![CDATA[NOAA Screening Quick Reference Tables]]></source>
<year>2008</year>
<page-range>34</page-range><publisher-loc><![CDATA[Seattle (WA) ]]></publisher-loc>
<publisher-name><![CDATA[National Oceanic and Atmospheric Administration, Office of Response and Restoration Division]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Calvert]]></surname>
<given-names><![CDATA[SE]]></given-names>
</name>
<name>
<surname><![CDATA[Pedersen]]></surname>
<given-names><![CDATA[TF]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Geochemistry of Recent oxic and anoxic marine sediments: Implications for the geological record]]></article-title>
<source><![CDATA[Mar Geol]]></source>
<year>1993</year>
<volume>113</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>67-88</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<collab>[CCME] Canadian Council of Ministers of the Environment</collab>
<source><![CDATA[Canadian Sediment Quality Guidelines for the Protection of Aquatic Life. Environment Canada. National Guidelines and Standards Office]]></source>
<year>2001</year>
<publisher-loc><![CDATA[Hull (QC, Canada) ]]></publisher-loc>
<publisher-name><![CDATA[CCME]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carriquiry]]></surname>
<given-names><![CDATA[JD]]></given-names>
</name>
<name>
<surname><![CDATA[Horta-Puga]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The Ba/Ca record of corals from the Southern Gulf of Mexico: Contributions from land-use changes, fluvial discharge and oil-drilling muds]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2010</year>
<volume>60</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>1625-30</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Celis-Hernandez]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
<name>
<surname><![CDATA[Rosales-Hoz]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Cundy]]></surname>
<given-names><![CDATA[AB]]></given-names>
</name>
<name>
<surname><![CDATA[Carranza-Edwards]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Croudace]]></surname>
<given-names><![CDATA[IW]]></given-names>
</name>
<name>
<surname><![CDATA[Hernandez-Hernandez]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Historical trace element accumulation in marine sediments from the Tamaulipas shelf, Gulf of Mexico: An assessment of natural vs anthropogenic inputs]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2018</year>
<volume>622-623</volume>
<page-range>325-36</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cervigón]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<source><![CDATA[Las Dependencias Federales. Serie Historias Regionales]]></source>
<year>1995</year>
<page-range>170</page-range><publisher-loc><![CDATA[Caracas (Venezuela) ]]></publisher-loc>
<publisher-name><![CDATA[Biblioteca de la Academia Nacional de la Historia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cheung]]></surname>
<given-names><![CDATA[BMY]]></given-names>
</name>
<name>
<surname><![CDATA[Cheung]]></surname>
<given-names><![CDATA[TT]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[No lead is better than a little lead]]></article-title>
<source><![CDATA[Postgrad Med J]]></source>
<year>2017</year>
<volume>93</volume>
<page-range>512</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cook]]></surname>
<given-names><![CDATA[DE]]></given-names>
</name>
<name>
<surname><![CDATA[Gale]]></surname>
<given-names><![CDATA[SJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The curious case of the date of introduction of leaded fuel to Australia: Implications for the history of Southern Hemisphere atmospheric lead pollution]]></article-title>
<source><![CDATA[Atmos Environ]]></source>
<year>2005</year>
<volume>39</volume>
<numero>14</numero>
<issue>14</issue>
<page-range>2553-7</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Franco]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
<name>
<surname><![CDATA[Viñas]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Soriano]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[de Armas]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[JJ]]></given-names>
</name>
<name>
<surname><![CDATA[Beiras]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Salas]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Bayona]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Albaigés]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spatial distribution and ecotoxicity of petroleum hydrocarbons in sediments from the Galicia continental shelf (NW Spain) after the Prestige oil spill]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2006</year>
<volume>53</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>260-71</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Freije]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Heavy metal, trace element and petroleum hydrocarbon pollution in the Arabian Gulf: Review]]></article-title>
<source><![CDATA[Journal of the Association of Arab Universities for Basic and Applied Sciences]]></source>
<year>2015</year>
<volume>17</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>90-100</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fuentes]]></surname>
<given-names><![CDATA[MVH]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas de Astudillo]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Díaz]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distribución de metales pesados en los sedimentos superficiales del Saco del Golfo de Cariaco, Sucre, Venezuela]]></article-title>
<source><![CDATA[Rev Biol Trop]]></source>
<year>2010</year>
<volume>58</volume>
<numero>suppl</numero>
<issue>suppl</issue>
<page-range>129-40</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Monitoreo ambiental pozo exploratorio Tuna 1X]]></source>
<year>2011</year>
<publisher-loc><![CDATA[Venezuela ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Simon Bolivar, Instituto de Tecnología y Ciencias Marinas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Monitoreo Ambiental Post-exploración, Bloque Cardón IV, Perla 5. Technical report]]></source>
<year>2014</year>
<page-range>343</page-range><publisher-loc><![CDATA[Venezuela ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Simon Bolivar, Instituto de Tecnología y Ciencias Marinas]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[EM]]></given-names>
</name>
<name>
<surname><![CDATA[Bastidas]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Cruz-Motta]]></surname>
<given-names><![CDATA[JJ]]></given-names>
</name>
<name>
<surname><![CDATA[Farina]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metals in waters and sediments of the Morrocoy National Park, Venezuela: increased contamination levels of cadmium over time]]></article-title>
<source><![CDATA[Water Air Soil Poll]]></source>
<year>2011</year>
<volume>214</volume>
<page-range>609-21</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García-Miragaya]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Sosa]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Trace metals in Valencia lake (Venezuela) sediments]]></article-title>
<source><![CDATA[Water Air Soil Poll]]></source>
<year>1994</year>
<volume>77</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>141-50</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González de Juana]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Muñoz]]></surname>
<given-names><![CDATA[JNG]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Rocas ultramáficas en la Península de Paria, Venezuela = Ultramafic rocks on the Paria Peninsula, Venezuela. Asociación Venezolana de Minería y Petróleo]]></article-title>
<source><![CDATA[Boletín Informativo]]></source>
<year>1968</year>
<volume>11</volume>
<numero>2</numero>
<issue>2</issue>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="book">
<collab>[GESAMP] IMO/FAO/UNESCO-IOC/WMO/IAEA/UN/UNEP/UNIDO Joint Group of Experts on the Scientific Aspects of Marine Environmental Protection</collab>
<source><![CDATA[Report of the Thirty-fourth Session]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Paris (France) ]]></publisher-loc>
<publisher-name><![CDATA[GESAMP]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harding]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Dalziel]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Vass]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Bioaccumulation of methylmercury within the marine food web of the outer Bay of Fundy, Gulf of Maine]]></article-title>
<source><![CDATA[PLOS ONE]]></source>
<year>2018</year>
<volume>13</volume>
<numero>7</numero>
<issue>7</issue>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jaffé]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Leal]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Alvarado]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Gardinali]]></surname>
<given-names><![CDATA[PR]]></given-names>
</name>
<name>
<surname><![CDATA[Sericano]]></surname>
<given-names><![CDATA[JL]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Baseline study on the levels of organic pollutants and heavy metals in bivalves from the Morrocoy National Park, Venezuela]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>1998</year>
<volume>36</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>925-9</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lieuwen]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Petróleo en Venezuela: Una historia]]></source>
<year>1955</year>
<page-range>246</page-range><publisher-loc><![CDATA[Caracas (Venezuela) ]]></publisher-loc>
<publisher-name><![CDATA[Cruz del Sur Ediciones]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Long]]></surname>
<given-names><![CDATA[ER]]></given-names>
</name>
<name>
<surname><![CDATA[Field]]></surname>
<given-names><![CDATA[LJ]]></given-names>
</name>
<name>
<surname><![CDATA[MacDonald]]></surname>
<given-names><![CDATA[DD]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Predicting toxicity in marine sediments with numerical sediment quality guidelines]]></article-title>
<source><![CDATA[Environ Toxicol Chem]]></source>
<year>1998</year>
<volume>17</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>714-27</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Loring]]></surname>
<given-names><![CDATA[DH]]></given-names>
</name>
<name>
<surname><![CDATA[Rantala]]></surname>
<given-names><![CDATA[RTT]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Manual for the geochemical analyses of marine sediments and suspended particulate matter]]></article-title>
<source><![CDATA[Earth-Sci Rev]]></source>
<year>1992</year>
<volume>32</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>235-83</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Maanan]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ruiz-Fernández]]></surname>
<given-names><![CDATA[AC]]></given-names>
</name>
<name>
<surname><![CDATA[Maanan]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Fattal]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Zourarah]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Sahabi]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A long-term record of land use change impacts on sediments in Oualidia lagoon, Morocco]]></article-title>
<source><![CDATA[Int J Sediment Res]]></source>
<year>2014</year>
<volume>29</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>1-10</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mahu]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Nyarko]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Hulme]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Coale]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distribution and enrichment of trace metals in marine sediments from the Eastern Equatorial Atlantic, off the Coast of Ghana in the Gulf of Guinea]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2015</year>
<volume>98</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>301-7</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Márquez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
<name>
<surname><![CDATA[Senior]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[Á]]></given-names>
</name>
<name>
<surname><![CDATA[Fermín]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metales pesados en sedimentos superficiales del río Orinoco, Venezuela]]></article-title>
<source><![CDATA[Bol Inst Oceanogr Venezuela]]></source>
<year>2012</year>
<volume>51</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>3-18</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Márquez]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Ysambertt]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[de la Cruz]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Three analytical methods to isolate and characterize vanadium and nickel porphyrins from heavy crude oil]]></article-title>
<source><![CDATA[Anal Chim Acta]]></source>
<year>1999</year>
<volume>395</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>343-9</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miloslavich]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Klein]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Ecorregiones marinas del caribe venezolano. In: Klein E (ed.), Prioridades de PDVSA en la Conservación de la Biodiversidad en el Caribe Venezolano]]></source>
<year>2008</year>
<page-range>16-9</page-range><publisher-loc><![CDATA[Caracas (Venezuela) ]]></publisher-loc>
<publisher-name><![CDATA[Petróleos de Venezuela, Universidad Simón Bolívar, The Nature Conservancy]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mohammed]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[May]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Echols]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Walther]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Manoo]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Maraj]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Agard]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Orazio]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metals in sediments and fish from Sea Lots and Point Lisas Harbors, Trinidad and Tobago]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2012</year>
<volume>64</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>169-73</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monaco]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Chianese]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Riccio]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Delgado-Sanchez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Lacorte]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spatial distribution of heavy hydrocarbons, PAHs and metals in polluted areas. The case of &#8220;Galicia&#8221;, Spain]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2017</year>
<volume>121</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>230-7</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Müller]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Index of geoaccumulation in the sediments of the Rhine River]]></article-title>
<source><![CDATA[Geojournal]]></source>
<year>1969</year>
<volume>2</volume>
<page-range>108-18</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muñoz-Barbosa]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Gutiérrez-Galindo]]></surname>
<given-names><![CDATA[EA]]></given-names>
</name>
<name>
<surname><![CDATA[Daesslé]]></surname>
<given-names><![CDATA[LW]]></given-names>
</name>
<name>
<surname><![CDATA[Orozco-Borbón]]></surname>
<given-names><![CDATA[MV]]></given-names>
</name>
<name>
<surname><![CDATA[Segovia-Zavala]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Relationship between metal enrichments and a biological adverse effects index in sediments from Todos Santos Bay, northwest coast of Baja California, México]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2012</year>
<volume>64</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>405-9</page-range></nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Neff]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
</person-group>
<source><![CDATA[Composition, environmental fates and biological effects of water based drilling muds and cuttings discharged to the marine environment: A synthesis and annotated bibliography. Duxbury (MA): Petroleum Environmental Research Forum (PERF), American Petroleum Institute]]></source>
<year>2005</year>
<page-range>73</page-range></nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Norville]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spatial distribution of heavy metals in sediments from the Gulf of Paria, Trinidad]]></article-title>
<source><![CDATA[Rev Biol Trop]]></source>
<year>2005</year>
<volume>53</volume>
<page-range>33-40</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Olsgard]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Gray]]></surname>
<given-names><![CDATA[JS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A comprehensive analysis of the effects of offshore oil and gas exploration and production on the benthic communities of the Norwegian continental shelf]]></article-title>
<source><![CDATA[Mar Ecol Prog Ser]]></source>
<year>1995</year>
<volume>122</volume>
<page-range>277-306</page-range></nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez-Fernández]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Viñas]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Besada]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A new perspective on marine assessment of metals and organic pollutants: A case study from Bay of Santander]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2019</year>
<volume>691</volume>
<page-range>156-64</page-range></nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[PJ]]></given-names>
</name>
</person-group>
<source><![CDATA[Corales de Venezuela]]></source>
<year>2001</year>
<page-range>219</page-range><publisher-loc><![CDATA[Nueva Esparta (Venezuela) ]]></publisher-loc>
<publisher-name><![CDATA[Coordinación Estado Nueva Esparta]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramos]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Cipriani]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Guzman]]></surname>
<given-names><![CDATA[HM]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Chronology of mercury enrichment factors in reef corals from western Venezuela]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2009</year>
<volume>58</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>222-9</page-range></nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reimann]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[de Caritat]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distinguishing between natural and anthropogenic sources for elements in the environment: regional geochemical surveys versus enrichment factors]]></article-title>
<source><![CDATA[Sci Total Environ]]></source>
<year>2005</year>
<volume>337</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>91-107</page-range></nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sinex]]></surname>
<given-names><![CDATA[SA]]></given-names>
</name>
<name>
<surname><![CDATA[Helz]]></surname>
<given-names><![CDATA[GR]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Regional geochemistry of trace elements in Chesapeake Bay sediments]]></article-title>
<source><![CDATA[Environ Geol]]></source>
<year>1981</year>
<volume>3</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>315-23</page-range></nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Toledo]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Lemus]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Chung]]></surname>
<given-names><![CDATA[KS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cooper, cadmium and lead in the fish Cyprinodon dearborni, in the sediments and in the water of two lagoons in Venezuela]]></article-title>
<source><![CDATA[Rev Biol Trop]]></source>
<year>2000</year>
<volume>48</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>225-31</page-range></nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Turekian]]></surname>
<given-names><![CDATA[KK]]></given-names>
</name>
<name>
<surname><![CDATA[Wedepohl]]></surname>
<given-names><![CDATA[KH]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distribution of the elements in some major units of the Earth&#8217;s crust]]></article-title>
<source><![CDATA[Geol Soc Am Bull]]></source>
<year>1961</year>
<volume>72</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>175-92</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Valdés]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Sifeddine]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Ortlieb]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Guiñez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Distribution and enrichment evaluation of heavy metals in Mejillones Bay (23ºS), Northern Chile: Geochemical and statistical approach]]></article-title>
<source><![CDATA[Mar Pollut Bull]]></source>
<year>2005</year>
<volume>50</volume>
<numero>12</numero>
<issue>12</issue>
<page-range>1558-68</page-range></nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wright]]></surname>
<given-names><![CDATA[DA]]></given-names>
</name>
<name>
<surname><![CDATA[Welbourn]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<source><![CDATA[Environmental Toxicology]]></source>
<year>2002</year>
<page-range>630</page-range><publisher-loc><![CDATA[New York (NY) ]]></publisher-loc>
<publisher-name><![CDATA[Cambridge University Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yuan]]></surname>
<given-names><![CDATA[G-L]]></given-names>
</name>
<name>
<surname><![CDATA[Sun]]></surname>
<given-names><![CDATA[T-H]]></given-names>
</name>
<name>
<surname><![CDATA[Han]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Lang]]></surname>
<given-names><![CDATA[XX]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Source identification and ecological risk assessment of heavy metals in topsoil using environmental geochemical mapping: Typical urban renewal area in Beijing]]></article-title>
<source><![CDATA[China. J Geochem Explor]]></source>
<year>2014</year>
<volume>136</volume>
<page-range>40-7</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
