<?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>0379-3982</journal-id>
<journal-title><![CDATA[Revista Tecnología en Marcha]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnología en Marcha]]></abbrev-journal-title>
<issn>0379-3982</issn>
<publisher>
<publisher-name><![CDATA[Instituto Tecnológico de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0379-39822018000200136</article-id>
<article-id pub-id-type="doi">10.18845/tm.v31i2.3631</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Determinación de As (III) y As (V) en los pozos de las plantas de remoción de arsénico de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Determination of As (III) and As (V) in the Wells of the arsenic removal plants in Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias-Barrantes]]></surname>
<given-names><![CDATA[Betzabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Urbina]]></surname>
<given-names><![CDATA[Azucena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alavarado-Gómez]]></surname>
<given-names><![CDATA[Ana Lorena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Sección de química de agua potable, Laboratorio Nacional de Aguas del Instituto Costarricense de Acueductos y Alcantarillados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica.</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Sección de química de agua potable, Laboratorio Nacional de Aguas del Instituto Costarricense de Acueductos y Alcantarillados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica. Escuela de Química ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>136</fpage>
<lpage>146</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0379-39822018000200136&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0379-39822018000200136&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0379-39822018000200136&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se realizó la separación y cuantificación del arsénico soluble, particulado, As (III) y As (V) en los pozos de las seis plantas de remoción de arsénico operadas por AyA en Guanacaste y Alajuela: Bebedero de Cañas, Montenegro y Agua Caliente, Falconiana y Quintas Don Miguel en el cantón de Bagaces y Santa Cecilia de El Amparo y Cristo Rey en Los Chiles. Se empleó la espectrometría de masas con plasma de acoplamiento inductivo (ICP-MS) así como cromatografía de intercambio aniónico (CIA) con resina Dowex 1-X8 de 50 a 100 mallas. Se validó la metodología obteniendo las siguientes figuras de mérito: límite de detección 0,1 µg/L, límite de cuantificación 0,2 µg/L, veracidad de diferentes fracciones y mezclas entre (97-104) %, con coeficientes de variación entre (0,9-12,8) %, así como una repetibilidad de 0,2 % y una repetibilidad intermedia de 0,3 % (n=7). Se efectuaron ocho muestreos mensuales y en los seis pozos prevalece el arsénico soluble sobre el particulado. En todos los pozos guanacastecos y en Cristo Rey de Los Chiles predomina As(V) sobre As (III), siendo el As (III) no detectable, detectable o en concentraciones ligeramente superiores al límite de cuantificación. En el caso de Santa Cecilia de El Amparo, hay mezcla de As (III) y As(V) en razones de concentraciones muy similares y predominando uno sobre otro dependiendo del muestreo. Además, este pozo es el que posee menor concentración de oxígeno disuelto (1,5 mg/L), mientras que los restantes pozos presentan concentraciones superiores.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Separation and quantification of soluble and particulate arsenic and As (III) and As (V) were carried out in the wells of six arsenic removal plants operated by AyA in Guanacaste and Alajuela: Bebedero de Cañas, Montenegro and Agua Caliente, Falconiana and Quintas Don Miguel in Bagaces and Santa Cecilia de El Amparo and Cristo Rey in Los Chiles. Inductively coupled plasma mass spectrometry and anion exchange chromatography with Dowex 1-X8 resin were used for this analysis. The methodology was validated, obtaining the following figures of merit: detection limit 0,1 µg/L, quantification limit 0,2 µg/L, veracity as recoveries of different fractions and mixtures between (97-104) %, with variation coefficient between (0,9-12,8) %, as well as repeatability 0,2 % and intermediate repeatability of 0,3 % (n=7). Eight samples were taken monthly wich indicated that in the six wells soluble arsenic prevails on the particulate arsenic. On the other hand, in all the Guanacaste wells and in Cristo Rey de Los Chiles predominates As (V) than As (III), As (III) being undetectable, detectable or in concentrations slightly higher than quantification limit. In the case of Santa Cecilia de El Amparo, there is a mixture of As (III) and As (V) in very similar proportion and predominating one over another depending on the sampling. In addition, this well has the lowest concentration of dissolved oxygen (1,5 mg/L), whereas the remaining wells present higher concentrations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Aguas de consumo]]></kwd>
<kwd lng="es"><![CDATA[arsénico]]></kwd>
<kwd lng="es"><![CDATA[arsenito]]></kwd>
<kwd lng="es"><![CDATA[arseniato]]></kwd>
<kwd lng="es"><![CDATA[arsénico soluble]]></kwd>
<kwd lng="es"><![CDATA[arsénico particulado]]></kwd>
<kwd lng="es"><![CDATA[espectrometría de masas con plasma de acoplamiento inductivo]]></kwd>
<kwd lng="es"><![CDATA[estados de oxidación]]></kwd>
<kwd lng="es"><![CDATA[intercambio aniónico]]></kwd>
<kwd lng="en"><![CDATA[Drinking water]]></kwd>
<kwd lng="en"><![CDATA[arsenic]]></kwd>
<kwd lng="en"><![CDATA[arsenite]]></kwd>
<kwd lng="en"><![CDATA[arsenate]]></kwd>
<kwd lng="en"><![CDATA[soluble arsenic]]></kwd>
<kwd lng="en"><![CDATA[particulate arsenic]]></kwd>
<kwd lng="en"><![CDATA[inductively coupled plasma mass spectrometry]]></kwd>
<kwd lng="en"><![CDATA[oxidation states]]></kwd>
<kwd lng="en"><![CDATA[anion exchanged]]></kwd>
</kwd-group>
</article-meta>
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