<?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>0120-2812</journal-id>
<journal-title><![CDATA[Acta Agronómica]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Agron.]]></abbrev-journal-title>
<issn>0120-2812</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-28122019000300237</article-id>
<article-id pub-id-type="doi">10.15446/acag.v68n3.75456</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Electrochemical quantification of chlorpyrifos in white (Allium cepa L.) and green (Allium fistulosum L.) onions]]></article-title>
<article-title xml:lang="es"><![CDATA[Cuantificación voltamétrica de clorpirifos en cebolla de bulbo (Allium. cepa L.) y cebolla de rama (Allium fistulosum L.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Colmenares]]></surname>
<given-names><![CDATA[José Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Páez Cepeda]]></surname>
<given-names><![CDATA[Leidy Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaparro Acuña]]></surname>
<given-names><![CDATA[Sandra Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia Grupo de investigación en Química Ambiental ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sao Paulo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brasil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Pedagógica y Tecnológica de Colombia Grupo de investigación en Catálisis ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2019</year>
</pub-date>
<volume>68</volume>
<numero>3</numero>
<fpage>237</fpage>
<lpage>243</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-28122019000300237&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-28122019000300237&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-28122019000300237&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The Linear sweep voltammetry method (LSP) of a common pesticide such as chlorpyrifos (CP) an organophosphate pesticide (OPP) in white (Allium cepa L.) and green onions (Allium fistulosum L.) was investigated. A hanging mercury drop electrode (HMDE) Ag/AgCl was used as reference electrode and platinum as a counter electrode. The OPP was extracted from the onion through liquid-liquid partition using acetone/dichloromethane as the solvent. Validated method was compared with GC/ECD as a reference method. CP concentration was not different between the two analytical techniques; the analysis was performed with a confidence level of 90%, corresponding to the polarographic method. CP concentration was 0.8400 ± 0.062 ppm in Allium cepa and 0.062 ± 0.300 ppm in Allium fistulosum L. These values exceed the ADI and ARD values for chlorpyrifos established by current regulations.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En el trabajo se cuantificó la concentración de clorpirifos (CP), un plaguicida organofosforado (POF) en cebolla de bulbo (Allium cepa) y en cebolla de rama (Allium fistulosum L.) utilizando el método polarográfico de barrido lineal (LSP). El estudio fue realizado usando como buffer solución Britton-Robinson, electrodo de trabajo gota estática de mercurio (HMDE) Ag/AgCl como electrodo de referencia y platino como electrodo auxiliar. El POF en cebolla se extrajo por reparto líquido-líquido, utilizando acetona/diclorometano como solvente. El método polarográfico validado fue comparado con GC/ECD, como validación de referencia. La concentración de CP determinada por ambas técnicas de análisis no presentó diferencia significativa (P &gt; 0.01), correspondiente al método polarográfico. La concentración de CP en cebolla junca (Allium cepa) fue calculada en 0.8400 ± 0.062 ppm y en la cebolla cabezona (Allium fistulosum L.) en 0.062 ± 0.300 ppm, estos valores sobrepasan el LMR y el IDA, establecidos por la normativa vigente (FAO/OMS, 2000, 2006).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chlorpyrifos]]></kwd>
<kwd lng="en"><![CDATA[Linear Sweep Polarography]]></kwd>
<kwd lng="en"><![CDATA[onion]]></kwd>
<kwd lng="en"><![CDATA[organophosphates]]></kwd>
<kwd lng="es"><![CDATA[Clorpirifos]]></kwd>
<kwd lng="es"><![CDATA[Cebolla]]></kwd>
<kwd lng="es"><![CDATA[Organofosforados]]></kwd>
<kwd lng="es"><![CDATA[Polarografía de Barrido Lineal.]]></kwd>
</kwd-group>
</article-meta>
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