<?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>0120-9965</journal-id>
<journal-title><![CDATA[Agronomía Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. colomb.]]></abbrev-journal-title>
<issn>0120-9965</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Agronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-99652021000100037</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v39n1.90918</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of swine manure biochar on sorption equilibrium of cadmium and zinc in sandy soils]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos del biocarbón hecho a base de estiércol porcino en el equilibrio de sorción de cadmio y zinc en suelos arenosos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos de Assis]]></surname>
<given-names><![CDATA[Wellyton]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caldeira do Nascimento]]></surname>
<given-names><![CDATA[Elisamara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[D'Acunha]]></surname>
<given-names><![CDATA[Brenda]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[dos Santos Weber]]></surname>
<given-names><![CDATA[Oscarlina Lúcia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaspar Dores]]></surname>
<given-names><![CDATA[Eliana Freire]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guimarães Couto]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal de Mato Grosso  ]]></institution>
<addr-line><![CDATA[Cuiaba ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of British Columbia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Canada</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal de Mato Grosso  ]]></institution>
<addr-line><![CDATA[Cuiaba ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal de Mato Grosso  ]]></institution>
<addr-line><![CDATA[Cuiaba ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>37</fpage>
<lpage>46</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652021000100037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652021000100037&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652021000100037&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Swine manure is an agricultural waste that can increase soil fertility. However, this residue has a high content of heavy metals, particularly zinc (Zn) and cadmium (Cd), that are not only toxic to plants and soil organisms but they also pose a great threat to human health due to the potential accumulation of these metals through the food chain. Transforming swine manure into biochar and adding it to soils can improve the soil's capacity to retain heavy metals. The main objective of this research was to study the capacity of sandy soils mixed with different doses of swine manure biochar (SMB) to retain Cd and Zn as well as to evaluate the sorption equilibrium of these metals. Sorption essays were performed by adding solutions of Zn (ZnCl2) or Cd (CdCl2) at different concentrations (0, 2.5, 5, 10, 50 and 100 mg L-1) to soil samples mixed with different doses of SMB (0, 0.25, 0.75, 1.5, and 3.0 % (w/w)). The data were modelled using both Langmuir and Freundlich adsorption isotherm models to describe the adsorption processes. The data were best represented by the Langmuir model (R2&gt;0.97), indicating a mono-layer sorption to the surface. Results showed that sorption capacity of Zn and Cd increased with the dose of SMB, improving metal retention. The Langmuir constant (KL) for soil without SMB for Cd and Zn were 0.01 L mg-1 and 0.05 L mg-1, respectively. With the highest dose of SMB, KL increased to 9.86 L mg-1 and 1.26 L mg-1 for Cd and Zn, respectively. Results suggest that SMB has the potential to mitigate Zn and Cd contamination of sandy soils.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El estiércol de cerdo es un residuo agrícola que puede aumentar la fertilidad del suelo. Sin embargo, este residuo tiene un alto contenido de metales pesados, principalmente zinc (Zn) y cadmio (Cd), los cuales no sólo son tóxicos para las plantas y los organismos del suelo, sino que también representan una gran amenaza para la salud humana por su potencial acumulación en la cadena alimentaria. Transformar el estiércol en biocarbón y agregarlo al suelo puede mejorar la capacidad del suelo para retener metales pesados. El objetivo principal de este trabajo fue estudiar la capacidad de suelos arenosos mezclados con diferentes dosis de biocarbón de estiércol porcino (BEP) para retener Cd y Zn, y evaluar el equilibrio de sorción de estos metales. Las pruebas de sorción se realizaron agregando soluciones de Zn (ZnCl2) o Cd (CdCl2) en diferentes concentraciones (0, 2.5, 5, 10, 50 y 100 mg L-1) a muestras de suelo mezcladas con diversas dosis de BEP (0, 0.25, 0.75, 1.5, y 3.0% (w/w). Los datos fueron modelados de acuerdo con las isotermas de Freundlich y Langmuir para describir los procesos de adsorción. El modelo de Langmuir representó mejor los datos (R2&gt;0.97), lo que indica una absorción de monocapa a la superficie. Los resultados mostraron que la capacidad de sorción de Zn y Cd aumentó con la dosis de BEP, mejorando la retención de metales. La constante de Langmuir (KL) para el suelo sin BEP para Cd y Zn fue 0.01 L mg-1 y 0.05 L mg-1, respectivamente. Con las dosis más altas de BEP, KL aumentó a 9.86 L mg-1 y 1.26 L mg-1 para Cd y Zn, respectivamente. Los resultados sugieren que el BEP tiene el potencial de mitigar la contaminación por Zn y Cd en suelos arenosos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[pyrolized carbon]]></kwd>
<kwd lng="en"><![CDATA[agricultural wastes]]></kwd>
<kwd lng="en"><![CDATA[sorption]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="es"><![CDATA[carbono pirolizado]]></kwd>
<kwd lng="es"><![CDATA[residuos agropecuarios]]></kwd>
<kwd lng="es"><![CDATA[sorción]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
</kwd-group>
</article-meta>
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