<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742020000300224</article-id>
<article-id pub-id-type="doi">10.22201/cgeo.20072902e.2020.3.1586</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Los parámetros magnéticos como indicadores de contaminación por elementos mayores y plomo en suelos urbanos del Valle de Aburrá, Colombia]]></article-title>
<article-title xml:lang="en"><![CDATA[Magnetic parameters as indicators of major elements and lead contamination in urban soils from Aburrá valley, Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Duque]]></surname>
<given-names><![CDATA[Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cejudo]]></surname>
<given-names><![CDATA[Rubén]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Goguitchaichvili]]></surname>
<given-names><![CDATA[Avto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Solano]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Investigaciones en Geografía Ambiental Laboratorio Universitario de Geofísica Ambiental]]></institution>
<addr-line><![CDATA[Morelia Mich.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica Unidad Michoacán Laboratorio Universitario de Geofísica Ambiental]]></institution>
<addr-line><![CDATA[Morelia Mich.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Tecnológico Nacional de México  ]]></institution>
<addr-line><![CDATA[Morelia Mich.]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Escuela Nacional de Estudios Superiores ]]></institution>
<addr-line><![CDATA[Morelia Mich.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>37</volume>
<numero>3</numero>
<fpage>224</fpage>
<lpage>236</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742020000300224&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742020000300224&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742020000300224&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos un estudio de magnetismo ambiental con el objetivo de determinar la relación de los elementos mayores y el plomo con los parámetros magnéticos en suelos urbanos del Área Metropolitana de Valle de Aburrá (AMVA), Colombia. El estudio se realizó con la finalidad de establecer indicadores magnéticos que permitan estimar la concentración de minerales magnéticos, de elementos mayores y de Pb; así como ubicar espacialmente las áreas de mayor contaminación en la zona urbana del AMVA. El estudio se realizó a partir de 83 muestras de suelo urbano, las cuales fueron sujetas a un análisis magnético; se determinó la concentración de los elementos mayores (Al2O3, Fe2O3 y MnO) y Pb por medio de fluorescencia de Rayos X de dispersión de energía. Se encontró una variación en la distribución del material magnético en el suelo urbano, el cual contiene una mezcla de mine- rales magnéticos de baja coercitividad o magnetita de origen natural y antrópico. Se detectaron partículas de tamaño superparamagnético en concentraciones medias y bajas en los suelos de baja emisión de partículas antrópicas, lo que sugiere un origen natural. Por otra parte, mediante la combinación de los parámetros magnéticos y el comportamiento de curvas termomagnéticas se encontraron suelos con concentración alta de mineral magnético de origen antrópico. Las concentraciones de Al2O3 y Fe2O3 son altas y similares en la mayor parte de los suelos urbanos. Los usos de suelo residencial y de espacio público que tienen pocas fuentes de emisión de partículas antrópicas presentaron un contenido bajo de Pb, mientras que los usos de suelo de tipo comercial e industrial, que muestran mayor actividad antrópica (tráfico vehicular), presentaron una concentración de Pb mayor. El suelo de los espacios públicos con baja emisión de partículas antrópicas fue empleado para determinar el valor de referencia para cada elemento y parámetro magnético. El análisis estadístico mostró que los suelos del AMVA tienen una relación directamente proporcional entre el material magnético y la concentración de Pb e inversamente proporcional con la concentración de Al2O3, Fe2O3 y MnO. El modelo matemático que predice la concentración de elementos a partir de parámetros magnéticos tiene una precisión del 63 % y se encontró que el área que ocupan las zonas de acumulación de material magnético y contenido de Pb es de alrededor de 46 km2, lo cual representa el 25 % de la zona urbana estudiada y es el área probable de riesgo a la salud por acumulación de material contaminante.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present a study of environmental magnetism in order to determine the relationship between magnetic parameters and heavy metals in urban soils of the Metropolitan Area of Valle de Aburrá (MAVA), Colombia, in order to establish magnetic indicators that allow estimating concentrations of magnetic minerals, mayor elements, and Pb, and to determine the area of their accumulations in the urban zone of the Metropolitan Area of Valle de Aburrá. The study was carried out on 83 samples of topsoil, which were subject to magnetic analyses. The concentration of mayor elements (Al  2 O  3 , Fe2O3 y MnO) and Pb was determined by energy dispersive X Ray Fluorescence. A variation of magnetic material in the urban soils was found, which contain a mixture of magnetic minerals of low coercivity or natural magnetite of anthropogenic origin. Particles of superparamagnetic size were detected at medium and low concentrations in soils with low anthropic activity, suggesting a natural origin. On the other hand, by the combination of magnetic parameters and thermomagnetic curves we found high concentrations of magnetic minerals of anthropic origin in the soils. The concentrations of Al  2 O  3 y Fe  2 O  3 are high and similar in the urban soil. Soils from areas of residential and public space use, which have few emission sources of anthropogenic particles, showed low concentration of Pb. On the other hand, soils from areas of industrial and commercial use, with high anthropogenic activity (vehicular traffic), showed high concentration of Pb. Soils from public space areas with low anthropic activity were employed to determine the reference threshold value for each element and magnetic parameter. The statistical analyses showed that the magnetic mineral content in the MAVA soils has a direct proportional relationship with the Pb concentration, and an inverse proportional relationship with the Al  2 O  3 , Fe  2 O  3 and MnO concentration. We developed a mathematic model that estimates the concentration of elements from magnetic parameters with a precision of 63 %. High accumulation of magnetic minerals and high Pb concentration occur in an area of 46 km  2 , which represents 25 % of the urban zone, and is the probable zone of health risk by accumulation of polluted material.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[parámetros magnéticos]]></kwd>
<kwd lng="es"><![CDATA[suelo]]></kwd>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[plomo]]></kwd>
<kwd lng="es"><![CDATA[elementos mayores]]></kwd>
<kwd lng="es"><![CDATA[valores de referencia]]></kwd>
<kwd lng="es"><![CDATA[distribución espacial]]></kwd>
<kwd lng="es"><![CDATA[Valle de Aburrá]]></kwd>
<kwd lng="es"><![CDATA[Colombia]]></kwd>
<kwd lng="en"><![CDATA[Magnetic parameters]]></kwd>
<kwd lng="en"><![CDATA[soil]]></kwd>
<kwd lng="en"><![CDATA[contamination]]></kwd>
<kwd lng="en"><![CDATA[lead]]></kwd>
<kwd lng="en"><![CDATA[major elements]]></kwd>
<kwd lng="en"><![CDATA[threshold value]]></kwd>
<kwd lng="en"><![CDATA[spatial distribution]]></kwd>
<kwd lng="en"><![CDATA[Aburrá valley, Colombia]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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