<?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>2221-2442</journal-id>
<journal-title><![CDATA[Revista CENIC Ciencias Químicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. CENIC Cienc. Quím.]]></abbrev-journal-title>
<issn>2221-2442</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Investigaciones Científicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2221-24422020000100049</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Procedimiento analítico para el análisis cromatográfico de muestras con fines geoquímicos.]]></article-title>
<article-title xml:lang="en"><![CDATA[Analytical procedure for chromatographic analysis of samples for geochemical purposes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero Hernández]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oropesa Rodríguez]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Fernández]]></surname>
<given-names><![CDATA[Reinaldo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez Sardiñas]]></surname>
<given-names><![CDATA[Zulema]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ayllón Torres]]></surname>
<given-names><![CDATA[Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación del Petróleo  ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>49</fpage>
<lpage>61</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2221-24422020000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2221-24422020000100049&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2221-24422020000100049&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  El petróleo crudo es una mezcla natural altamente compleja que consiste predominantemente de hidrocarburos [alcanos (parafinas), alquenos (olefinas) y compuestos aromáticos] con otros elementos tales como azufre, nitrógeno y oxígeno. La geoquímica de yacimientos parte del principio básico que dentro de un yacimiento donde no existan barreras de permeabilidad ocurrirá una homogeneización composicional de los crudos, de tal forma que en cualquier parte del yacimiento se presentará la misma composición o &#8220;fingerprints&#8221;. Por tal motivo resulta necesario desarrollar un método cromatográfico para el análisis de los compuestos ligeros en muestras de petróleo crudo (fracción C15-). Se seleccionaron siete muestras de crudos ligeros, medianos y mediano-pesados, en la caracterización geoquímica de discontinuidades y compartimentaciones en reservorios. Se utiliza, como técnica de rutina sobre crudo total, la cromatografía de gases de alta resolución, la interpretación de los resultados que se obtienen contribuye a reducir la probabilidad de perforar pozos petroleros improductivos, los parámetros cromatográficos se mantuvieron invariantes en el análisis de las muestras de petróleo de crudo total, lo cual facilitó el estudio de la composición de las especies moleculares presentes. La identificación de los compuestos se basó en los tiempos de retención y por la comparación con patrones de referencia. Se identificaron 100 picos cromatográficos correspondientes a la fracción ligera C15- (cicloparafinas, naftenos y aromáticos). De ellos se seleccionaron 22 y se obtuvieron sus alturas para cada muestra. La repetibilidad y la precisión intermedia en todos los casos fueron inferior al 3 %, lo cual demostró la precisión del método analítico desarrollado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Crude oil is a highly complex natural mixture consisting predominantly of hydrocarbons [alkanes (paraffins), alkenes (olefins) and aromatics] with other elements such as sulfur, nitrogen and oxygen. The geochemistry of the deposits starts from the basic principle that within a deposit where there are no permeability barriers, a compositional homogenization of the crude will occur, so that in any part of the deposit the same composition or "fingerprints" will be presented. For this reason it is necessary to develop a chromatographic method for the analysis of light compounds in samples of crude oil (fraction C15-). Seven light, medium and medium-heavy crude samples were selected. In the geochemical characterization of discontinuities and compartmentalisations in reservoirs, high-resolution gas chromatography is used as a routine technique on total crude oil, the interpretation of the results obtained obtained contributes to reduce the probability of drilling unproductive oil wells, the chromatographic parameters remained invariant in the analysis of the crude oil samples, which facilitated the study of the composition of the molecular species present. The identification of the compounds was based on the retention times and by comparison with reference standards. 100 chromatographic peaks corresponding to the light fraction C15- (cycloparaffins, naphthenes and aromatics) were identified. Of these, 22 were selected and their heights were obtained for each sample. The repeatability and intermediate precision in all cases were less than 3%, which demonstrated the precision of the analytical method developed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[petróleo crudo]]></kwd>
<kwd lng="es"><![CDATA[yacimiento]]></kwd>
<kwd lng="es"><![CDATA[caracterización geoquímica]]></kwd>
<kwd lng="es"><![CDATA[cromatografía]]></kwd>
<kwd lng="es"><![CDATA[identificación]]></kwd>
<kwd lng="en"><![CDATA[Crude oil]]></kwd>
<kwd lng="en"><![CDATA[deposit]]></kwd>
<kwd lng="en"><![CDATA[geochemical characterization]]></kwd>
<kwd lng="en"><![CDATA[chromatography]]></kwd>
<kwd lng="en"><![CDATA[identification]]></kwd>
</kwd-group>
</article-meta>
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