<?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>S0188-49992020000400797</article-id>
<article-id pub-id-type="doi">10.20937/rica.53318</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[MOVILIDAD DE ARSÉNICO EN LOS SEDIMENTOS DE UNA PRESA QUE RECIBE ESCURRIMIENTOS DE MINAS EPITERMALES]]></article-title>
<article-title xml:lang="en"><![CDATA[ARSENIC MOBILITY IN THE SEDIMENTS OF A DAM THAT RECEIVES RUNOFFS FROM EPITHERMAL MINES]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bravo Covarrubias]]></surname>
<given-names><![CDATA[América]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[Ester]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayora]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos Arroyo]]></surname>
<given-names><![CDATA[Yann René]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guanajuato División de Ingenierías Departamento de Hidráulica y Geomática]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Consejo Superior de Investigaciones Científicas-Instituto de Diagnóstico Ambiental y Estudios del Agua (CSIC-IDAEA)  ]]></institution>
<addr-line><![CDATA[Barcelona ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>36</volume>
<numero>4</numero>
<fpage>797</fpage>
<lpage>811</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992020000400797&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992020000400797&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992020000400797&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este trabajo tuvo como objetivo cuantificar As, Pb, Fe y Mn en las fases minerales de sedimentos recientes en una presa que recibe escurrimientos de minas abandonadas y plantear escenarios de retención y liberación de As en y desde el reservorio. La presa Santana (PS) se encuentra a la salida de una cuenca con tres embalses en cascada en el municipio de Guanajuato. Las cuatro muestras analizadas se recolectaron a 0.1 m de profundidad a lo largo de un transecto topográfico-geoquímico al interior de la PS. Se aplicó un protocolo de extracciones secuenciales de siete pasos considerando la reactividad y movilidad, para conocer de este modo los contenidos elementales en las distintas fases minerales y la potencial translocación entre ellas. Los extractos de cada fracción, así como una digestión ácida de cada muestra, se analizaron mediante masa de plasma acoplada inductivamente y emisión atómica plasmática acoplada inductivamente. Se generaron imágenes mediante microscopia electrónica de barrido de una muestra recolectada en la cortina. El contenido elemental total de sedimentos arrojó los siguientes valores (en mg kg-1): As, 25.11 a 28.80; Pb, 0.64 a 2.83; Mn, 562.3 a 862.3; Fe, 51 276.3 a 79 820.5. Desde la entrada y hacia la cortina, el As disminuye en la fracción de óxidos cristalinos; en contraste, se incrementa en la fracción intercambiable de óxidos amorfos y sulfuros. La concentración de Fe aumenta en la fracción intercambiable de óxidos amorfos y de sulfuros. El Mn se acumula cerca de la cortina, principalmente en fracciones de óxidos amorfos y cristalinos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The objective of this work was to quantify As, Pb, Fe and Mn in the mineral phases of recent sediments in a dam that receives runoffs from abandoned mines and to propose scenarios of retention and release of As in and from the reservoir. The Santana dam (SD) is located at the exit of a basin with three reservoirs in cascade in the municipality of Guanajuato. The four samples analyzed were collected at a depth of 0.1 m along a topographic-geochemical transect inside the SD. A protocol of sequential extractions of seven steps was applied considering the reactivity and mobility, in order to know the elemental contents in the different mineral phases and the potential translocations between them. The extracts of each fraction as well as an acid digestion of each sample were analyzed by inductively coupled plasma mass spectroscopy and inductively coupled plasma atomic emission. Images were generated by scanning electron microscopy of a sample collected in the curtain. The total elemental content in sediments yielded the following values (in mg kg-1): As, 25.11 to 28.80; Pb, 0.64 to 2.83; Mn, 562.3 to 862.3; Fe, 51 276.3 to 79 820.5. From the entrance and towards the curtain, As decreases in the fraction of crystalline oxides; in contrast, it increases in the exchangeable fraction of amorphous oxides and sulphides. The concentration of iron increases in the exchangeable fraction of amorphous oxides and sulphides. Manganese accumulates near the curtain, mainly in the fractions of amorphous and crystalline oxides.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[abastecimiento]]></kwd>
<kwd lng="es"><![CDATA[extracción secuencial]]></kwd>
<kwd lng="es"><![CDATA[transecto geoquímico]]></kwd>
<kwd lng="es"><![CDATA[reservorio]]></kwd>
<kwd lng="en"><![CDATA[supply]]></kwd>
<kwd lng="en"><![CDATA[sequential extraction]]></kwd>
<kwd lng="en"><![CDATA[geochemical transect]]></kwd>
<kwd lng="en"><![CDATA[reservoir]]></kwd>
</kwd-group>
</article-meta>
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