<?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>S0188-49992005000300107</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[OPTIMIZACIÓN Y PUESTA A PUNTO DE UN MÉTODO DE MINERALIZACIÓN DE MUESTRAS AMBIENTALES PARA LA DETERMINACIÓN DE ULTRATRAZAS DE PLATINO, RODIO Y PALADIO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León-Rojas]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Química ]]></institution>
<addr-line><![CDATA[San Pedro, Montes de Oca ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2005</year>
</pub-date>
<volume>21</volume>
<numero>3</numero>
<fpage>107</fpage>
<lpage>113</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992005000300107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992005000300107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992005000300107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se desarrolló una metodología para la mineralización de muestras ambientales, para el posterior análisis de ultratrazas de platino, rodio y paladio, utilizando la técnica voltamperométrica. El método propuesto utiliza una mezcla de HNO3, HCl y HClO4, en un mineralizador con alta presión (HPA) y temperatura máxima de 320 °C a 100 bar de presión de nitrógeno. Los estudios de recuperación dieron resultados cercanos al 100 % y demuestran que la metodología desarrollada es adecuada para el análisis de los elementos bajo estudio. Sin embargo, se trata de un procedimiento largo y de mucho cuidado, con el fin de evitar la pérdida de los analitos o la contaminación de las muestras.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT A methodology for the mineralization of environmental samples was developed, for the later analysis of ultratraces of platinum, rhodium and palladium, by voltammetry. The proposed method uses a mixture of HNO3, HCl and HClO4, in a high pressure digester (HPA), with a maximum temperature of 320 °C and 100 bar of pressure. The recovery studies gave results near 100 % and demonstrate that the developed methodology is useful for the analysis of the elements under study. Nevertheless, it is a long procedure that requires being careful, in order to avoid the loss of the elements or the contamination of the samples.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ultratrazas]]></kwd>
<kwd lng="es"><![CDATA[mineralización]]></kwd>
<kwd lng="es"><![CDATA[platino]]></kwd>
<kwd lng="es"><![CDATA[rodio]]></kwd>
<kwd lng="es"><![CDATA[paladio]]></kwd>
<kwd lng="en"><![CDATA[ultratraces]]></kwd>
<kwd lng="en"><![CDATA[mineralization]]></kwd>
<kwd lng="en"><![CDATA[platinum]]></kwd>
<kwd lng="en"><![CDATA[rhodium]]></kwd>
<kwd lng="en"><![CDATA[palladium]]></kwd>
</kwd-group>
</article-meta>
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