<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992018000400713</article-id>
<article-id pub-id-type="doi">10.20937/rica.2018.34.04.12</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[ENRIQUECIMIENTO NATURAL DE NÍQUEL Y VANADIO EN NÚCLEOS DE SEDIMENTO CERCANOS A SITIOS DE EXTRACCIÓN DE CRUDO EN EL GOLFO DE MÉXICO]]></article-title>
<article-title xml:lang="en"><![CDATA[NICKEL AND VANADIUM NATURAL ENRICHMENT IN SEDIMENT CORES NEAR OIL EXTRACTION SITES IN THE GULF OF MEXICO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bojórquez-Sánchez]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marmolejo-Rodríguez]]></surname>
<given-names><![CDATA[Ana Judith]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Fernández]]></surname>
<given-names><![CDATA[Ana Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-González]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Cabeza]]></surname>
<given-names><![CDATA[Joan-Albert]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bojórquez-Leyva]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Bernal]]></surname>
<given-names><![CDATA[Libia Hascibe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología Unidad Académica Mazatlán]]></institution>
<addr-line><![CDATA[Mazatlán ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias del Mar y Limnología Departamento Procesos Oceánicos y Costeros]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Politécnica de Sinaloa  ]]></institution>
<addr-line><![CDATA[Mazatlán Sinaloa]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>34</volume>
<numero>4</numero>
<fpage>713</fpage>
<lpage>723</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992018000400713&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992018000400713&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992018000400713&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La zona costera de Veracruz se encuentra adyacente al área de extracción de crudo del Golfo de México. Elementos como el Ni y el V pueden utilizarse como indicadores de actividades de extracción de crudo. Con la finalidad de evaluar el aporte de elementos relacionados con las actividades petroleras, se analizaron los contenidos de Ni y V en dos núcleos (LL1, LL2) de sedimento de la laguna El Llano, Veracruz. Como análisis complementarios para evaluar las tendencias verticales de los elementos en el sedimento, se analizaron los mayoritarios Al, Ca, Fe, y traza Co, Li, Mn, Sr y Zn mediante espectrometría de masas con plasma acoplado inductivamente (ICP-MS, por sus siglas en inglés). Además se determinó el tamaño de grano (mediante difracción láser) y el carbono orgánico (con analizador elemental). Los resultados mostraron sedimentos predominantemente arenosos en ambos núcleos y valores de carbono orgánico relativamente bajos (&lt; 3 %). El promedio de las concentraciones de Ni y V fue superior a los promedios de la corteza continental. Los factores de enriquecimiento normalizados alcanzaron niveles moderadamente enriquecidos para Ni (FEN = 4) y significativamente enriquecidos para V (FEN = 6) en ambos núcleos. La proporción Ni/V en ambos núcleos indicó enriquecimiento de V respecto de Ni y diferente origen de ambos elementos. Se determinó una asociación de Ni con elementos terrígenos: Al, Fe, Co, Li, y Zn. Por el contrario, el V no se asoció con estos elementos. Los perfiles de V han tenido incrementos cíclicos desde las secciones más profundas hacia la superficie en ambos núcleos. Dichos incrementos pueden deberse a descargas esporádicas de afloramientos bituminosos naturales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The coastal area of Veracruz state is located next to the oil extraction area of the Gulf of Mexico. Elements as Ni and V can be indicators of activities of oil extraction. In order to evaluate the contribution of Ni and V related to petroleum activities two sediment cores (LL1, LL2), from the El Llano lagoon in Veracruz. Moreover, major (Al, Ca, Fe) and trace elements (Co, Li, Mn, Sr, and Zn) content was also analyzed with inductively coupled plasma mass spectroscopy (ICP-MS). Complementary, grain size (with laser diffraction) and organic carbon (with elemental analyzer) were analyzed. The grain size results showed predominantly sandy sediments in both cores and relatively low (&lt; 3 %) organic carbon results. Average concentrations of Ni and V were higher than the continental crust average. Normalized enrichment factors reached moderately enriched levels for Ni (NEF = 4) and significantly enrichment for V (NEF = 6) in both cores. The Ni/V ratio indicated enrichment of V and different origin of both elements. Nickel was associated with Al, Fe, Co, Li, and Zn. On the contrary, V was not associated with those elements; it had cyclic increments since the deep sections to the surface probably associated to sporadic releases of natural bituminous oil seeps.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
<kwd lng="es"><![CDATA[petróleo]]></kwd>
<kwd lng="es"><![CDATA[Veracruz]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="en"><![CDATA[petroleum]]></kwd>
<kwd lng="en"><![CDATA[Veracruz]]></kwd>
</kwd-group>
</article-meta>
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