<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992019000200469</article-id>
<article-id pub-id-type="doi">10.20937/rica.2019.35.02.17</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[MODELOS DE CALIBRACIÓN PARA LA CUANTIFICACIÓN ESPECTROFOTOMÉTRICA DE HIDROCARBUROS TOTALES DEL PETRÓLEO EN SUELO]]></article-title>
<article-title xml:lang="en"><![CDATA[CALIBRATION MODELS FOR THE SPECTROPHOTOMETRIC QUANTIFICATION OF TOTAL OIL HYDROCARBONS IN SOIL]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arguijo-Portillo]]></surname>
<given-names><![CDATA[Nadia Viridiana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerrero-Peña]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez-Rodríguez]]></surname>
<given-names><![CDATA[Verónica Isidra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Ávila]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zavala-Cruz]]></surname>
<given-names><![CDATA[Joel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[H. Cárdenas Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Champotón Campeche]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>2</numero>
<fpage>469</fpage>
<lpage>479</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992019000200469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992019000200469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992019000200469&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los modelos de calibración usados en química analítica deben ser previamente validados para cumplir con su objetivo, lo que generalmente se hace mediante análisis de regresión. En el presente estudio se proponen estrategias de validación interna y externa de modelos de calibración lineal simple (MCLS) para determinar hidrocarburos totales del petróleo (HTP) mediante espectrometría ultravioleta-visible (UV-Vis). En la validación cruzada, el modelo se emplea para estimar una a una las concentraciones de referencia con las que fue construido/calibrado, mientras que en la validación externa estima concentraciones de referencias que no fueron utilizadas en la calibración, con lo cual se demuestra su robustez. Se construyeron y validaron cuatro modelos, demostrando en todos los casos la linealidad y robustez de los MCLS en el rango estudiado. Los cuatro MCLS son adecuados para su aplicación en la cuantificación espectrofotométrica de HTP en suelos o en agua extraídos con diferentes disolventes, en cantidades que se encuentran dentro de los límites máximos permitidos en la normativa mexicana. En los modelos calibrados se identificó el efecto matricial debido al tipo de disolvente usado para diluir los hidrocarburos y por el tipo de hidrocarburo, lo cual influyó en los límites de detección y cuantificación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Calibration models used in analytical chemistry must be previously validated to achieve their aim. Generally, this is achieved by means of regression analysis. This study proposes strategies of internal and external validation of simple linear calibration models (LCM) to determine total petroleum hydrocarbons (TPH) by means of ultraviolet visible spectrometry (UV-Vis). In the crossed validation, the model is used to estimate one by one the reference concentrations with which it was constructed/calibrated, whereas in the external validation the model estimates reference concentrations that were not used in its calibration, which demonstrates its robustness. Four models were constructed and validated, demonstrating in all cases the linearity and robustness of the MCLS in the studied range. All the models were adequate for the spectrometric quantification of TPH in soils or in water extracted by different solvents, in quantities that comply with the maximum permissible limits established by Mexican regulations. In the calibrated models, the matrix effect was identified due to the type of solvent used to dilute the hydrocarbons and the type of hydrocarbon, which is influenced by the limits of detection and quantification.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[regresión lineal]]></kwd>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[petróleo crudo]]></kwd>
<kwd lng="en"><![CDATA[linear regression]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[crude oil]]></kwd>
</kwd-group>
</article-meta>
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