<?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>2007-9028</journal-id>
<journal-title><![CDATA[Ecosistemas y recursos agropecuarios]]></journal-title>
<abbrev-journal-title><![CDATA[Ecosistemas y recur. agropecuarios]]></abbrev-journal-title>
<issn>2007-9028</issn>
<publisher>
<publisher-name><![CDATA[Universidad Juárez Autónoma de Tabasco, Dirección de Investigación y Posgrado]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-90282018000100055</article-id>
<article-id pub-id-type="doi">10.19136/era.a5n13.1334</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Water quality of the Grijalva river on the Chiapas - Tabasco border]]></article-title>
<article-title xml:lang="es"><![CDATA[Calidad de agua del río Grijalva en la frontera de Chiapas y Tabasco]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Musálem-Castillejos]]></surname>
<given-names><![CDATA[Karim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Laino-Guanes]]></surname>
<given-names><![CDATA[Rafaela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bello-Mendoza]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Marcial]]></surname>
<given-names><![CDATA[Neptalí]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[San Cristóbal de Las Casas Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación del Chaco Americano  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Paraguay</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Canterbury  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Nueva Zelanda</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>5</volume>
<numero>13</numero>
<fpage>55</fpage>
<lpage>64</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-90282018000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-90282018000100055&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-90282018000100055&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT. The objective was to characterize the water quality in a section of the Grijalva River and in some of its tributaries on the border between the States of Chiapas and Tabasco, in the rainy and dry seasons. Twenty-three physical, chemical and microbiological parameters as well as contaminants were determined. The values obtained were compared with the maximum permissible limits (MPLs) for water use and human consumption set out in Official Mexican standard NOM-127-SSA1-1994, and with the water quality classification scale of the Comisión Nacional del Agua (CONAGUA). The water quality in the studied section of the Grijalva River decreases as it descends to more populated areas of the State of Tabasco. Water turbidity and E. coli coliform levels increase, both in the river channels and in sources destined for human consumption. For the other variables evaluated, there are acceptable water quality characteristics, mainly in the dry season, except for mercury, which occurs at levels higher than those recommended. Further studies on the presence of mercury in the Grijalva River basin are recommended.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN. El objetivo fue caracterizar la calidad de agua en una sección del río Grijalva y en algunos de sus afluentes en la frontera entre los estados de Chiapas y Tabasco, en la época de lluvias y secas. Se determinaron 23 variables que incluyeron parámetros fisicoquímicos, microbiológicos y de contaminantes, los valores obtenidos se compararon con los límites máximos permisibles (LMP) para agua de uso y consumo humano indicados en la Norma Oficial Mexicana NOM-127-SSA1-1994, y con la escala de clasificación de calidad del agua de la Comisión Nacional del Agua (CONAGUA). La calidad del agua en la sección del río Grijalva estudiada, disminuye en su descenso a las zonas pobladas del estado de Tabasco. La turbidez y los niveles de coliformes y E. coli incrementan, tanto en el cauce como en fuentes destinadas al consumo humano. Para las otras variables evaluadas, se tienen características aceptables de calidad del agua, principalmente en la época seca, con excepción del mercurio, que se presenta en niveles superiores a los recomendados. Se sugiere realizar estudios sobre la presencia del mercurio en la cuenca del Grijalva.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[coliforms]]></kwd>
<kwd lng="en"><![CDATA[Escherichia]]></kwd>
<kwd lng="en"><![CDATA[mercury]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="en"><![CDATA[turbidity]]></kwd>
<kwd lng="es"><![CDATA[coliformes]]></kwd>
<kwd lng="es"><![CDATA[Escherichia]]></kwd>
<kwd lng="es"><![CDATA[mercurio]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
<kwd lng="es"><![CDATA[turbidez]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alvarado-Arcia]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Ilizaliturri-Hernández]]></surname>
<given-names><![CDATA[CA]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez-Salinas]]></surname>
<given-names><![CDATA[RI]]></given-names>
</name>
<name>
<surname><![CDATA[Torres Dosal]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Riesgos ambientales y de salud por metales (cadmio y mercurio) presentes en suelos y sedimentos del río Grijalva]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Brunel-Manse]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<source><![CDATA[Montañas, pueblos y agua. Dimensiones y realidades de la Cuenca Grijalva]]></source>
<year>2014</year>
<page-range>240-56</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Juan Pablos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<collab>APHA</collab>
<source><![CDATA[Standard methods for the examination of water and wastewater]]></source>
<year>1998</year>
<edition>20</edition>
<page-range>1220</page-range><publisher-loc><![CDATA[California, USA ]]></publisher-loc>
<publisher-name><![CDATA[American Public Health Association]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bjørklund]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Dadar]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Mutter]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Aaseth]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The toxicology of mercury: Current research and emerging trends]]></article-title>
<source><![CDATA[Environmental Research]]></source>
<year>2017</year>
<volume>159</volume>
<page-range>545-54</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Borbolla-Sala]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[de la Cruz-Vázquez]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Piña-Gutiérrez]]></surname>
<given-names><![CDATA[OE]]></given-names>
</name>
<name>
<surname><![CDATA[Fuente-Gutiérrez]]></surname>
<given-names><![CDATA[JC]]></given-names>
</name>
<name>
<surname><![CDATA[Garrido Pérez]]></surname>
<given-names><![CDATA[SMG]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calidad de agua en Tabasco]]></article-title>
<source><![CDATA[Salud en Tabasco]]></source>
<year>2003</year>
<volume>9</volume>
<page-range>170-7</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bryan]]></surname>
<given-names><![CDATA[GW]]></given-names>
</name>
<name>
<surname><![CDATA[Langston]]></surname>
<given-names><![CDATA[WJ]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Bioavailability, accumulation and effects of heavy metals in sediments with special reference to United Kingdom Estuaries: a review]]></article-title>
<source><![CDATA[Environmental Pollution]]></source>
<year>1992</year>
<volume>76</volume>
<page-range>89-131</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castañon]]></surname>
<given-names><![CDATA[JH]]></given-names>
</name>
<name>
<surname><![CDATA[Abraján]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Análisis de la calidad del agua superficial del río Sabinal, Tuxtla Gutiérrez, Chiapas, México (2009)]]></article-title>
<source><![CDATA[Lacandonia]]></source>
<year></year>
<volume>3</volume>
<page-range>67-77</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<collab>CONAGUA</collab>
<source><![CDATA[Atlas del agua en México 2011]]></source>
<year>2011</year>
<page-range>133</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Comisión Nacional del Agua, Secretaría de Medio Ambiente y Recursos Naturales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Di Rienzo]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Casanoves]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Balzarini]]></surname>
<given-names><![CDATA[MG]]></given-names>
</name>
<name>
<surname><![CDATA[Gonzalez]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Tablada]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Robledo]]></surname>
<given-names><![CDATA[CW]]></given-names>
</name>
</person-group>
<source><![CDATA[InfoStat versión 2015]]></source>
<year>2015</year>
<publisher-loc><![CDATA[Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Grupo InfoStat]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Galdos-Balzategui]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Carmona-de la Torre]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez-Pérez H]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Morales-López J]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Torres-Dosal]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Urbina]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación cuantitativa del riesgo microbiológico por consumo de agua en San Cristóbal de Las Casas, Chiapas, México]]></article-title>
<source><![CDATA[Tecnología y Ciencias del Agua]]></source>
<year>2017</year>
<volume>8</volume>
<page-range>133-1153</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Marcial]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Pineda]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Parra-Vázquez]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Díaz-Hernández]]></surname>
<given-names><![CDATA[BM]]></given-names>
</name>
<name>
<surname><![CDATA[Musálem-Castillejos]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Vulnerabilidad ambiental y social. Perspectivas para la restauración de bosques en la Sierra Madre de Chiapas]]></article-title>
<source><![CDATA[Investigación Ambiental Ciencia y Política Pública]]></source>
<year>2014</year>
<volume>6</volume>
<page-range>89-108</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guentzel]]></surname>
<given-names><![CDATA[JL]]></given-names>
</name>
<name>
<surname><![CDATA[Portilla]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Keith]]></surname>
<given-names><![CDATA[KM]]></given-names>
</name>
<name>
<surname><![CDATA[Keith]]></surname>
<given-names><![CDATA[EO]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Mercury transport and bioaccumulation in riverbank communities of the Alvarado Lagoon System, Veracruz State, Mexico]]></article-title>
<source><![CDATA[Science of the Total Environment]]></source>
<year>2007</year>
<volume>388</volume>
<page-range>316-24</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jiménez-Cisneros]]></surname>
<given-names><![CDATA[BE]]></given-names>
</name>
</person-group>
<source><![CDATA[La contaminación ambiental en México: causas, efectos y tecnología apropiada]]></source>
<year>2001</year>
<page-range>926</page-range><publisher-loc><![CDATA[México, Distrito Federal, México ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Limusa]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kulinkina]]></surname>
<given-names><![CDATA[AV]]></given-names>
</name>
<name>
<surname><![CDATA[Mohan]]></surname>
<given-names><![CDATA[VR]]></given-names>
</name>
<name>
<surname><![CDATA[Francis]]></surname>
<given-names><![CDATA[MR]]></given-names>
</name>
<name>
<surname><![CDATA[Kattula]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Sarkar]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Plummer]]></surname>
<given-names><![CDATA[JD]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seasonality of water quality and diarrheal disease counts in urban and rural settings in south India]]></article-title>
<source><![CDATA[Scientific Reports]]></source>
<year>2016</year>
<volume>6</volume>
<page-range>20521</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laino-Guanes]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Marcial]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Bello-Mendoza]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Casanoves]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Human pressure on water quality and water yield in the upper Grijalva river basin in the Mexico-Guatemala border]]></article-title>
<source><![CDATA[Ecohydrology and Hydrobiology]]></source>
<year>2016</year>
<volume>16</volume>
<page-range>149-59</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Laino-Guanes]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Bello-Mendoza]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Marcial]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez-Otárola]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Musálem-Castillejos]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metal concentrations in water and sediments in the upper Grijalva river basin, Mexico-Guatemala border]]></article-title>
<source><![CDATA[Water Technology and Sciences]]></source>
<year>2015</year>
<volume>6</volume>
<page-range>61-74</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Leal-Ascencio]]></surname>
<given-names><![CDATA[MT]]></given-names>
</name>
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Prieto-García]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Gordillo]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metals pollution in the El Limon Lagoon, Chiapas, Mexico. Tropical and Subtropical]]></article-title>
<source><![CDATA[Agroecosystems]]></source>
<year>2009</year>
<volume>10</volume>
<page-range>415-21</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lintern]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Webb]]></surname>
<given-names><![CDATA[JA]]></given-names>
</name>
<name>
<surname><![CDATA[Ryu]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Bende-Michl]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[Waters]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Leahy]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Western]]></surname>
<given-names><![CDATA[AW]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Key factors influencing differences in stream water quality across space]]></article-title>
<source><![CDATA[WIREs Water]]></source>
<year>2018</year>
<volume>5</volume>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Musalem]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Jiménez]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Mc Donald]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Application of a rapid assessment tool for integrated watershed management: A case study from La Plata River Basin in South America]]></article-title>
<source><![CDATA[Aqua-LAC]]></source>
<year>2014</year>
<volume>5</volume>
<page-range>31-9</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pirrone]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Cinnirella]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Feng]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Finkelman]]></surname>
<given-names><![CDATA[RB]]></given-names>
</name>
<name>
<surname><![CDATA[Friedli]]></surname>
<given-names><![CDATA[HR]]></given-names>
</name>
<name>
<surname><![CDATA[Leaner]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Global mercury emissions to the atmosphere from antropogenic and natural sources]]></article-title>
<source><![CDATA[Atmospheric Chemistry and Physics]]></source>
<year>2010</year>
<volume>10</volume>
<page-range>5951-64</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Plascencia]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ramirez-Marcial]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Alvarez-Solis]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Musalem]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Características físico-bióticas de la cuenca del río Grijalva]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Brunel Manse]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<source><![CDATA[Montañas, pueblos y agua: dimensiones y realidades de la cuenca Grijalva]]></source>
<year>2014</year>
<page-range>29-79</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Juan Pablos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramírez-Marcial]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Musalem]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Noguera-Savelli]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Pineda]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estrategias para una construcción social de la restauración forestal en comunidades de la cuenca media y alta del río Grijalva]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Brunel Manse]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<source><![CDATA[Montañas, pueblos y agua: dimensiones y realidades de la cuenca Grijalva]]></source>
<year>2014</year>
<page-range>518-54</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Juan Pablos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ramos-Herrera]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Broca-Martinez]]></surname>
<given-names><![CDATA[LF]]></given-names>
</name>
<name>
<surname><![CDATA[Laines-Canepa]]></surname>
<given-names><![CDATA[JR]]></given-names>
</name>
<name>
<surname><![CDATA[Carrera-Velueta]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tendencia de la calidad del agua en ríos de Tabasco, México]]></article-title>
<source><![CDATA[Ingeniería]]></source>
<year>2012</year>
<volume>16</volume>
<page-range>207-17</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sánchez-Pérez]]></surname>
<given-names><![CDATA[HJ]]></given-names>
</name>
<name>
<surname><![CDATA[Vargas-Morales]]></surname>
<given-names><![CDATA[MG]]></given-names>
</name>
<name>
<surname><![CDATA[Méndez-Sánchez]]></surname>
<given-names><![CDATA[JD]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calidad bacteriológica del agua para consumo humano en zonas de alta marginación de Chiapas]]></article-title>
<source><![CDATA[Salud Publica de México]]></source>
<year>2000</year>
<volume>42</volume>
<page-range>397-406</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<collab>SCFI</collab>
<source><![CDATA[NMX-AA-42 -1987. Calidad de agua - Determinación del NMP de coliformes totales, coliformes fecales y Escherichia coli. México, Distrito Federal, México]]></source>
<year>1987</year>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-028-SCFI-2001. Análisis de agua - Determinación de la demanda bioquímica de oxígeno en aguas naturales, residuales (DBO5) y residuales tratadas. México, Distrito Federal, México]]></source>
<year>2001</year>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-029-SCFI-2001 Análisis de aguas - Determinación de Fósforo total en aguas naturales, residuales y residuales tratadas - Método de prueba. México, Distrito Federal, México]]></source>
<year>2001</year>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-030-SCFI (2001) Análisis de agua - Determinación de la demanda química de oxígeno en aguas naturales, residuales y residuales tratadas. México, Distrito Federal, México]]></source>
<year>2001</year>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-034-SCFI (2001) Análisis de agua - Determinación de sólidos y sales disueltas en aguas naturales, residuales y residuales tratadas. México, Distrito Federal, México]]></source>
<year>2001</year>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-051-SCFI-2001 Análisis de agua - determinación de metales por absorción atómica en aguas naturales, potables, residuales y residuales tratadas - Método de prueba. México, Distrito Federal, México]]></source>
<year>2001</year>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<collab>SE</collab>
<source><![CDATA[NMX-AA-099-SCFI-2006 Análisis de agua - Determinación de Nitrógeno de Nitritos en aguas naturales y residuales - métodos de prueba. México, Distrito Federal, México]]></source>
<year>2006</year>
</nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="book">
<collab>SEMARNAT</collab>
<source><![CDATA[Estadísticas del Agua en México]]></source>
<year>2015</year>
<page-range>295</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Secretaría de Medio Ambiente y Recursos Naturales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<collab>SS</collab>
<source><![CDATA[NOM-127-SSA1-1994 Norma Oficial Mexicana - Salud Ambiental. Agua para uso y consumo humano - Límites Permisibles de Calidad y Tratamientos a que debe someterse el agua para su potabilización. México, Distrito Federal, México]]></source>
<year>1994</year>
</nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Valencia-Barrera]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Delimitación de los módulos del proyecto FORDECyT: codificación de cuencas hidrográficas con la metodología Pfafstetter y consideraciones en su aplicación]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[González-Espinosa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Brunel Manse]]></surname>
<given-names><![CDATA[MC]]></given-names>
</name>
</person-group>
<source><![CDATA[Montañas, pueblos y agua: dimensiones y realidades de la cuenca Grijalva]]></source>
<year>2014</year>
<page-range>735-46</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Juan Pablos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Yu]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Zongxue]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Wei]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Zuo]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Effect of Land Use Types on Stream Water Quality under Seasonal Variation and Topographic Characteristics in the Wei River Basin, China]]></article-title>
<source><![CDATA[Ecological Indicators]]></source>
<year>2016</year>
<volume>60</volume>
<page-range>202-12</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
