<?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>S0120-99652022000300429</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v40n3.104911</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A predictive model for the determination of cadmium concentration in cocoa beans using laser-induced plasma spectroscopy]]></article-title>
<article-title xml:lang="es"><![CDATA[Modelo predictivo para la determinación de la concentración de cadmio en granos de cacao mediante espectroscopia de plasma inducido por láser]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Herrera Celis]]></surname>
<given-names><![CDATA[Sandra Liliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerrero Bermúdez]]></surname>
<given-names><![CDATA[Jáder Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mejía-Ospino]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabanzo Hernández]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Piedecuesta Santander]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga Santander]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<fpage>429</fpage>
<lpage>439</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652022000300429&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652022000300429&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652022000300429&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study proposes a predictive model to determine the concentration of cadmium (Cd) in cocoa beans based on laser-induced breakdown spectroscopy (LIBS) and partial least squares regression (PLSR-1 or PLS-1). The multivariate calibration model was developed using 46 cocoa bean samples, with Cd concentrations up to 1 mg kg-1. The increase of the LIBS signal in the Cd emission lines was evident when the cocoa bean sample was subjected to a solid-liquid-solid transformation (SLST). The range error ratio (RER) was 7.92, which allowed it to be classified as a screening model. Monte Carlo cross-validation was used, with 60% of samples for calibration and the remaining for testing. The standard error of cross-validation (SECV) and standard error of calibration (SEC) were 0.12 mg kg-1 and 0.05 mg kg-1, respectively. The proposed procedure is framed within the alternatives for the chemical analysis of cocoa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio propone un modelo para predecir la concentración de cadmio (Cd) en granos de cacao basado en espectroscopía de plasma inducido por láser (LIBS) y regresión por mínimos cuadrados parciales (PLSR-1 o PLS-1). El modelo de calibración fue desarrollado a partir de 46 muestras de granos de cacao con concentración no mayor a 1 mg kg-1. El incremento en la señal LIBS fue evidente cuando la muestra de grano de cacao fue sometida a una transformación sólido-líquido-sólido (SLST). La razón del rango de error (RER) es 7.92, lo que permite determinar que el modelo es de tamizaje. Se utilizó la estrategia de validación cruzada Montecarlo con el 60% de las muestras para calibración y las restantes para prueba. El error estándar de validación cruzada (SECV) y de calibración (SEC) fue 0.12 mg kg-1 y 0.05 mg kg-1, respectivamente. El procedimiento propuesto se ubica en el marco de las alternativas de inspección y análisis químico del cacao.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[inorganic contaminants]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="en"><![CDATA[partial least square regression]]></kwd>
<kwd lng="en"><![CDATA[atomic spectroscopy]]></kwd>
<kwd lng="es"><![CDATA[contaminantes inorgánicos]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
<kwd lng="es"><![CDATA[regresión por mínimos cuadrados parciales]]></kwd>
<kwd lng="es"><![CDATA[espectroscopía atómica]]></kwd>
</kwd-group>
</article-meta>
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