<?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>S0188-49992019000300609</article-id>
<article-id pub-id-type="doi">10.20937/rica.2019.35.03.08</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[RIESGO ECOLÓGICO POTENCIAL POR ARSÉNICO EN LA DESEMBOCADURA DEL RÍO LOA, NORTE DE CHILE]]></article-title>
<article-title xml:lang="en"><![CDATA[ECOLOGICAL POTENTIAL RISK BY ARSENIC IN THE LOAS&#8217;S RIVER MOUTH, NORTH OF CHILE]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[Venecia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A3"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrasco]]></surname>
<given-names><![CDATA[Cristian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Araneda]]></surname>
<given-names><![CDATA[Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varas]]></surname>
<given-names><![CDATA[Viviana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojo]]></surname>
<given-names><![CDATA[Cynthia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Arturo Prat Facultad de Ciencias de la Salud Laboratorio de Química Analítica y Ambiental]]></institution>
<addr-line><![CDATA[Iquique ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Arturo Prat Centro de Investigación del Medio Ambiente ]]></institution>
<addr-line><![CDATA[Iquique ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Arturo Prat Centro de Investigación y Desarrollo en Recursos Hídricos ]]></institution>
<addr-line><![CDATA[Iquique ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>3</numero>
<fpage>609</fpage>
<lpage>622</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992019000300609&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992019000300609&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992019000300609&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En el río, laguna y zona de mezcla del río Loa (norte de Chile), así como en las playas aledañas a su desembocadura, se determinó el riesgo ecológico potencial por arsénico en las fracciones disponibles del sedimento, con base en los efectos de rango bajo y medio. Se dedujeron la constante de distribución, el índice de geoacumulación (Igeo) y el factor de enriquecimiento (FE) de As. Para estimar el As reactivo se compararon tres procedimientos de extracción simple, y con el fin de obtener el código de evaluación de riesgo se aplicaron las dos primeras etapas de la extracción secuencial de Tessier y la biodisponibilidad según el esquema BCR modificado. Las aguas continentales saladas y alcalinas presentaron un carácter reductor, bajos contenidos de OD, N/P y Cu, pero As elevado (1.13-1.80 mg/L), diluido en el mar a 0.012 mg/L. Los sedimentos continentales neutros presentaron materia orgánica baja (2-6 %), niveles aceptables de N/P, CaCO3 (5.3-31 %) y Cu, pero As elevado (516-856 mg/kg). En sedimentos marinos alcanzó 20 mg/kg de As. Los valores del Igeo establecen la categoría de contaminación terrestre, pero no marina, aunque los FE confirman la presencia de riesgo potencial elevado en la desembocadura. Las extracciones simples y el código de evaluación de riesgo lo señalan como móvil y biodisponible. El nivel de As en el sedimento fluvial asociado a las fracciones intercambiable, reducible y oxidable, confirman riesgo potencial para el ecosistema en condiciones alcalinas y reductoras. En cambio, en el borde costero, el As se encuentra asociado mayoritariamente a las fracciones residual e intercambiable, lo cual reduce el riesgo potencial.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Potential ecological risk by arsenic in the available fractions of the sediment in the river, lagoon, mixing zone and beaches bordering the mouth of the Loa River, north of Chile, was determined based on low and medium range effects. The distribution constant, geoaccumulation index and As enrichment factor were deduced. To estimate reactive As, three simple extraction procedures were compared. In order to obtain the risk assessment code, the first two stages of sequential Tessier extraction and bioavailability were applied according to the modified BCR schema. The salty and alkaline continental waters showed a reducing character, low OD, N/P and Cu, but high As (1.13-1.80 mg/l), diluted in the sea at 0.012 mg/L. The neutral continental sediments presented low organic matter (2-6%), acceptable levels of N/P, CaCO3 (5.3-31%) and Cu, but elevated As (516-856 mg/kg). As reached levels of 20 mg/kg in marine sediments. According to the geoaccumulation index values, there was terrestrial but not marine pollution, although the enrichment factors confirm the presence of high potential risk at the river mouth. Simple extractions and the risk assessment code point to As as mobile and bioavailable. The level of As in the fluvial sediment associated with interchangeable, reducible and oxidizable fractions confirm potential risk for the ecosystem under alkaline and reducing conditions. On the other hand, in the coastal border As was found associated mainly with residual and interchangeable fractions, which reduces this potential risk.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[humedal]]></kwd>
<kwd lng="es"><![CDATA[biodisponibilidad]]></kwd>
<kwd lng="es"><![CDATA[extracción secuencial]]></kwd>
<kwd lng="es"><![CDATA[código de evaluación de riesgo]]></kwd>
<kwd lng="es"><![CDATA[efectos de rango bajo y medio]]></kwd>
<kwd lng="en"><![CDATA[wetland]]></kwd>
<kwd lng="en"><![CDATA[bioavailability]]></kwd>
<kwd lng="en"><![CDATA[sequential extraction]]></kwd>
<kwd lng="en"><![CDATA[risk assessment code]]></kwd>
<kwd lng="en"><![CDATA[low and medium range effect]]></kwd>
</kwd-group>
</article-meta>
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