<?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>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222017000100115</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2017-01-09</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización hidrogeoquímica de los acuíferos volcánicos Barva y Colima en el Valle Central de Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Hydrogeochemical characterization of Barva and Colima aquifers in the Central Valley of Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madrigal-Solís]]></surname>
<given-names><![CDATA[Helga]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca-Sánchez]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reynolds-Vargas]]></surname>
<given-names><![CDATA[Jenny]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<fpage>115</fpage>
<lpage>132</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222017000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222017000100115&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222017000100115&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La composición química del agua subterránea está determinada por procesos antropogénicos y por interacciones con el material geológico que conforma el acuífero. El presente estudio describe la caracterización hidrogeoquímica de los acuíferos volcánicos Barva y Colima, en el Valle Central de Costa Rica, con el fin de ampliar el conocimiento acerca de las interacciones entre ambos acuíferos y determinar si hay alguna evolución desde las zonas altas hasta las más bajas del acuífero Barva. Se realizaron de 1 a 9 campañas de muestreo en 51 sitios entre los años 2002 y 2004, y se analizaron los nitratos e iones mayoritarios. Las aguas del Barva y Colima se clasificaron como del tipo bicarbonatada mixta, con excepción de un sitio. Se encontró un aumento de bicarbonatos, cloruros, calcio, magnesio, sodio y potasio desde las partes altas hasta las partes bajas del acuífero Barva, probablemente por procesos de disolución natural de las rocas y lixiviación de iones provenientes de actividades antropogénicas. En el caso de los nitratos, se encontró una mediana de 0.2 mg/l de NO3-N en el sector de mayor altitud, mientras que en las partes de altitud mediana y baja, las medianas aumentaron a 3.6 y 5.3 mg/l, respectivamente. Sin embargo, el sector al suroeste de la zona de estudio presentó un aumento únicamente en bicarbonatos y sodio con respecto a la zona de menor altitud del acuífero Barva y, por el contrario, se encontraron concentraciones relativamente bajas de nitratos, con una mediana de 1.1 mg/l de NO3-N. En comparación con el acuífero Barva, el Colima presentó concentraciones más bajas de nitratos en sitios sobreyacidos por el acuífero Barva, por lo que se concluye que los nitratos provenientes de fuentes antrópicas son diluidos en este acuífero antes de su posible percolación hacia el Colima. Se recomienda mantener programas de monitoreo permanentes para evaluar posibles aumentos en las concentraciones de nitratos en ambos acuíferos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Anthropogenic processes and interactions with the geologic material in the aquifers determine the chemical composition of groundwater. This study describes the hydrogeochemical characterization of Barva and Colima volcanic aquifers in the Central Valley of Costa Rica, to contribute to the understanding of the interactions between the two aquifers and determine whether there is a chemical evolution from the upper to the lower sections of Barva aquifer. During 2002-2004, from one to 9 sampling campaigns were performed in 51 locations and, nitrates and major ions were analyzed. The waters of the Barva and Colima were of mixed Ca-Mg-Na-HCO3 type, except for one site. An increase in bicarbonates, chlorides, nitrates, calcium, magnesium, sodium and potassium was found from the highlands to the lowlands of Barva aquifer, probably due to natural dissolution of rocks and leaching of ions from anthropogenic activities. In terms of nitrates, the highlands showed a median of 0.2 mg/l of NO3-N, while in the midlands and lowlands the median concentrations increased to 3.6 and 5.3 mg/l, respectively. However, the southwestern region in the study area showed an increased in HCO3 - and Na+ ions solely and lower nitrates concentrations with respect to the lowlands of Barva aquifer, with a median of 1.1 mg/l of NO3-N. Compared to the Barva aquifer, the Colima presented lower concentrations of nitrates in locations overlain by Barva aquifer, since nitrates from anthropogenic sources are diluted in this aquifer before their possible percolation into Colima aquifer. It is recommended ongoing monitoring programs to assess potential increases in nitrate concentrations in both aquifers.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[acuíferos Barva y Colima]]></kwd>
<kwd lng="es"><![CDATA[hidrogeoquímica subterránea]]></kwd>
<kwd lng="es"><![CDATA[nitratos]]></kwd>
<kwd lng="es"><![CDATA[Piper]]></kwd>
<kwd lng="es"><![CDATA[Stiff]]></kwd>
<kwd lng="en"><![CDATA[Barva and Colima aquifers]]></kwd>
<kwd lng="en"><![CDATA[groundwater hidrogeochemistry]]></kwd>
<kwd lng="en"><![CDATA[nitrates]]></kwd>
<kwd lng="en"><![CDATA[Piper]]></kwd>
<kwd lng="en"><![CDATA[Stiff]]></kwd>
</kwd-group>
</article-meta>
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