<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342017000100171</article-id>
<article-id pub-id-type="doi">10.29312/remexca.v8i1.80</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Capacidad de intercambio catiónico: descripción del método de la tiourea de plata (AgTU + n )]]></article-title>
<article-title xml:lang="en"><![CDATA[Cation exchange capacity: description of the silver thiourea method (AgTU + n )]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Rosales]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galvis Spínola]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bugarín Montoya]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Mendoza]]></surname>
<given-names><![CDATA[Teresa Marcela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Peña]]></surname>
<given-names><![CDATA[Mario Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez González]]></surname>
<given-names><![CDATA[Agustín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Nayarit Ciudad de la cultura ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[Chapingo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio Mexicano de Especialistas en Recursos Naturales  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</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>171</fpage>
<lpage>177</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342017000100171&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342017000100171&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342017000100171&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La capacidad de intercambio catiónico (CIC) es un indicador indirecto de la capacidad amortiguadora de los suelos. Los métodos empleados para estimar la CIC se basan en la saturación del suelo con un catión índice. El método de la tiourea de plata (AgTU + n ) es una técnica para la estimación de la CIC, puesto que el AgTU + n no se encuentra de forma natural en el suelo; sin embargo, el Ag  + es sensible al espectro visible y al pH alcalino de la solución, formando Ag0 y Ag2O. En los suelos de estudio, la cantidad de muestra requerida para la estimación de la CIC fue 0.8 g. La protección de la cristalería con papel aluminio y el almacenamiento de los extractos en la oscuridad aumentó la vida útil del AgTU + n . La CICSI, como función de CICCI de 166 suelos tiene una relación lineal, es decir, que la variación en la estimación de la CIC es debida a la adsorción del AgTU + n en las arcillas de los suelos, y no por fuentes de variación generadas por otros iones. El método de la AgTU + n , permite estimar la CIC de manera rápida y a bajo costo, tomando en cuenta las consideraciones antes mencionadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The cation exchange capacity (CIC) is an indirect indicator of soil damping capacity. The methods used to estimate the CIC are based on soil saturation with an index cation. The silver thiourea method (AgTU + n) is a technique for estimating CIC, since AgTU + n is not Found naturally in the soil; however, Ag  + is sensitive to the visible spectrum and the alkaline pH of the solution, forming Ag0 and Ag2O. In the study soils, the amount of sample required for the estimation of CIC was 0.8 g. The protection of glassware with aluminum foil and the storage of extracts in the dark increased the shelf life of AgTU + n. the CICSI, as a function of CCICI of 166 soils, has a linear relationship, that is, that the variation in the CIC estimation is due to the adsorption of AgTU + n on the clays of the soils, and not by sources of variation generated by other ions. The AgTU + n method makes it possible to estimate the CIC quickly and inexpensively, taking into account the aforementioned considerations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bentonita]]></kwd>
<kwd lng="es"><![CDATA[flóculos y adsorción]]></kwd>
<kwd lng="en"><![CDATA[: bentonite]]></kwd>
<kwd lng="en"><![CDATA[flocs and adsorption]]></kwd>
</kwd-group>
</article-meta>
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