<?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>0188-4611</journal-id>
<journal-title><![CDATA[Investigaciones geográficas]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. Geog]]></abbrev-journal-title>
<issn>0188-4611</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geografía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-46111986000100004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Contaminación por cromo en el norte de la Ciudad de México, un enfoque interdisciplinario]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez R.]]></surname>
<given-names><![CDATA[Margarita Eugenia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bocco V.]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo B.]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de Mëxico Instituto de Geografía ]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de Mëxico Facultad de Química División de Estudios de Posgrado]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>1986</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>1986</year>
</pub-date>
<numero>16</numero>
<fpage>77</fpage>
<lpage>125</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46111986000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46111986000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46111986000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[En el municipio de Tultitlán, Edo. de México, se acumularon residuos industriales con un alto contenido de cromo en formas químicas muy solubles, por lo que el elemento se está dispersando en el entorno. Principalmente se infiltra y contamina aguas subterráneas, pero en menor medida también está afectando la atmósfera y los suelos. En este artículo se describen los niveles de cromo en aguas profundas y suelos; los antecedentes y las causas que provocaron el problema, las características del medio, una primera estimación del área afectada; y, finalmente, se plantean posibles soluciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Industrial residues, containing high concentra­tions of soluble chromium salts, have been accumulated in Tultitlan, Mexico. Consequently, chromium has been dispersed in the surroundings, mainly in the subsoil by percolation, and to a lesser extent it has also contaminated the atmosphere and soils. This paper presents some analytical results about the available amounts of chromium in groundwater and soils, together with a des­cription of the circumstances which gave rise to this problem, a characterization of the environment, a first estimate of the extent of the problem, and proposals for solutions.]]></p></abstract>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>Contaminaci&oacute;n por cromo en el norte de la Ciudad de M&eacute;xico, un enfoque interdisciplinario</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Margarita Eugenia Guti&eacute;rrez R.* Gerardo Bocco V.* y Silvia Castillo B.**</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">* <i>Instituto de Geograf&iacute;a, UNAM.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">** <i>Divisi&oacute;n de Estudios de Posgrado, Facultad de Qu&iacute;mica, UNAM.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En el municipio de Tultitl&aacute;n, Edo. de M&eacute;xico, se acumularon residuos industriales con un alto contenido de cromo en formas qu&iacute;micas muy solubles, por lo que el elemento se est&aacute; dispersando en el entorno. Principalmente se infiltra y contamina aguas subterr&aacute;neas, pero en menor medida tambi&eacute;n est&aacute; afectando la atm&oacute;sfera y los suelos. En este art&iacute;culo se describen los niveles de cromo en aguas profundas y suelos; los antecedentes y las causas que provocaron el problema, las caracter&iacute;sticas del medio, una primera estimaci&oacute;n del &aacute;rea afectada; y, finalmente, se plantean posibles soluciones.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Industrial residues, containing high concentra&shy;tions of soluble chromium salts, have been accumulated in Tultitlan, Mexico. Consequently, chromium has been dispersed in the surroundings, mainly in the subsoil by percolation, and to a lesser extent it has also contaminated the atmosphere and soils. This paper presents some analytical results about the available amounts of chromium in groundwater and soils, together with a des&shy;cription of the circumstances which gave rise to this problem, a characterization of the environment, a first estimate of the extent of the problem, and proposals for solutions.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/igeo/n16/n16a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Referencias bibliogr&aacute;ficas</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Apha, Awwa, FSIWA. 1955. M&eacute;todos normales para los ex&aacute;menes de aguas, aguas negras y desechos industriales. M&eacute;xico: Divisi&oacute;n de Salubridad, Bienestar y Habitaci&oacute;n, Instituto de Asuntos Internacionales.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619833&pid=S0188-4611198600010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Artiole, J. y W. Fuller. 1979. Effect of chromium attenuation in soils. <i>Journal of Environmental Quality</i>, 8(4): 503&#45;509.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619835&pid=S0188-4611198600010000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Aubert, H. y M. Pinta. 1980. Trace elements in soils; development in soil science. 7th ed. New York: Elsevier.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619837&pid=S0188-4611198600010000400003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">B&aacute;ez Pedrajo, Armando, Irma Rosa P&eacute;rez, Ra&uacute;l Belmont D&aacute;vila. 1977. Determinaci&oacute;n de cromo en dos poblaciones humanas no ocupacionalmente expuestas. <i>An. Inst. Biol. Ser. Biol. Exp.</i> 48(1): 77&#45;93.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619839&pid=S0188-4611198600010000400004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Barnett, Vic. 1984. Reimp. Elements of sampling theory. London: Hodder Stoushton.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619841&pid=S0188-4611198600010000400005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Bartlett, R.J. 1979. Behavior of chromium in soils: III Oxidation. <i>Journal of Environmental Quality</i>, 8(1): 31&#45;34.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619843&pid=S0188-4611198600010000400006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45; 1976a. Behavior of chromium in soils: II Hexavalent forms. <i>Journal of Environmental Quality</i>, 5(1): 283&#45;386.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619845&pid=S0188-4611198600010000400007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45; y J.M. Kimble 1976b. Behavior of chromium in soils: I trivalent forms. <i>Journal of Environmental Quality</i>, 5(4): 379&#45;382.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619847&pid=S0188-4611198600010000400008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Batley, F.E. y D. Gardner. 1977. Sampling and storage of natural waters for trace metal analysis. <i>Water research</i>, 11(9): 745&#45;756.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619849&pid=S0188-4611198600010000400009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Black, C.A. ed. 1965. Methods of Soil Analysis. Madison, Wisconsin: American Society of Agronomy.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619851&pid=S0188-4611198600010000400010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Chapman, H.D. ed. 1965. Diagnostic criteria for plants and soils. Riverside, Cal: Department of Soils and Plant Nutrition, University of California.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619853&pid=S0188-4611198600010000400011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Departamento del Distrito Federal. 1975. Memoria de las obras del sistema de drenaje profundo del Distrito Federal. M&eacute;xico: Talleres Gr&aacute;ficos de la Naci&oacute;n.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619855&pid=S0188-4611198600010000400012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Federal Security Agency, 1953. Health of workers in chromate producing industry. Washington, D.C.: the Agency (Public Health Service Publications, No. 192).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619857&pid=S0188-4611198600010000400013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">G&oacute;mez Arroyo Sandra y Rafael Villalobos Pietrini. 1983. Chromosoma alterations induced by some chromium salts. <i>Cytologia</i> 48:185&#45;193.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619859&pid=S0188-4611198600010000400014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Guti&eacute;rrez Ru&iacute;z Margarita Eugenia. 1982. Estudio del contenido de iones inorg&aacute;nicos y sus interacciones en suelos y plantas de los distritos de riego 03 y 88<i>.</i> M&eacute;xico. Tesis (maestr&iacute;a en Qu&iacute;mica). Universidad Nacional Aut&oacute;noma de M&eacute;xico.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619861&pid=S0188-4611198600010000400015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Jackson, M.L. 1954. An&aacute;lisis qu&iacute;mico de suelos. Barcelona: Omega.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619863&pid=S0188-4611198600010000400016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">James, B. y R.J. Bartlett. 1983a. Behavior of chromium in soils. VI. Interaction between oxidation, reduction and organic complexation<i>.</i> <i>Journal of Environmental Quality</i>, 12(2):173&#45;176.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619865&pid=S0188-4611198600010000400017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45; 1983b. Behavior of chromium in soils. VII. Adsortion and reduction of hexavalent forms<i>.</i> <i>Journal of Environmental Quality</i>, 12(2): 177&#45;180.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619867&pid=S0188-4611198600010000400018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Kirk y Othmer. 1979. Encyclopedia of chemical technology 3rd. ed. New York: J. Wiley. V.G., p. 54&#45;56, 82&#45;120.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619869&pid=S0188-4611198600010000400019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">National Research Council, Canada. Associate committe on Scientific Criteria for Environmental Quality. 1976. Effects of chromium in the candian environmental. Otawa: The Commitee (Pub. No. 15017).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619871&pid=S0188-4611198600010000400020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Purves, D. 1977. Trace elements contamination of the environment. Amsterdam: Elsevier.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619873&pid=S0188-4611198600010000400021&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Rosas P&eacute;rez, Irma. 1984. Aspectos ecotoxicol&oacute;gicos del cromo en una zona industrial del estado de M&eacute;xico. Tesis (doctorado en Ciencias). Universidad Nacional Aut&oacute;noma de M&eacute;xico.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619875&pid=S0188-4611198600010000400022&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45; Armando Ba&eacute;z Pedrajo y Ra&uacute;l Belmont D&aacute;vila. 1977. Cuantificaci&oacute;n de cromo en el suelo y vegetales de una zona contaminada por cromo residual de origen industrial. <i>An. Inst. Biol. ser. Biol. Exp.</i> 48(1): 95&#45;112.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619877&pid=S0188-4611198600010000400023&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Ross, D.F., R.E. Sjogren y R.J. Bartlett. 1981. Behavior of Chromium in soils: IV. Toxicity to microorganisms. <i>Journal of Environmental Quality</i>, 10 (2): 145&#45;148.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619879&pid=S0188-4611198600010000400024&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Secretar&iacute;a de Educaci&oacute;n, Cultura y Bienestar Social del Estado de M&eacute;xico. S.A. Resumen del asunto relativo a la industria Cromatos de M&eacute;xico, S.A. M&eacute;xico: la Secretar&iacute;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619881&pid=S0188-4611198600010000400025&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Secretar&iacute;a de Recursos Hidr&aacute;ulicos, Comisi&oacute;n Hidrol&oacute;gica de la Cuenca del Valle de M&eacute;xico. 1961a. Estudio geoqu&iacute;mico de las aguas subterr&aacute;neas en el valle de Cuautitl&aacute;n. M&eacute;xico: la Secretar&iacute;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619883&pid=S0188-4611198600010000400026&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45;&#45; 1961b. Hidrogeolog&iacute;a del valle de Cuautitl&aacute;n. M&eacute;xico: la Secretar&iacute;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619885&pid=S0188-4611198600010000400027&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Servicios Geof&iacute;sicos. 1966. Estudio hidrogeol&oacute;gico y geof&iacute;sico de la zona de Cuautitl&aacute;n. M&eacute;xico: los Servicios.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619887&pid=S0188-4611198600010000400028&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Trist&aacute;n, L.A. 1984. Estudio general del proyecto: Sulfato de aluminio reciclado de los desechos de la planta Cromatos de M&eacute;xico, S.A. M&eacute;xico: CINADI.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619889&pid=S0188-4611198600010000400029&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Valverde Valverde Carmen, Adr&iacute;an Guillermo Aguilar Mart&iacute;nez y Ma. Luisa Garc&iacute;a Amaral. 1980. Geograf&iacute;a urbana del municipio de Tultitl&aacute;n, estado de M&eacute;xico. Mecanograf&iacute;a.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=4619891&pid=S0188-4611198600010000400030&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<collab>Apha</collab>
<collab>Awwa</collab>
<collab>FSIWA</collab>
<source><![CDATA[Métodos normales para los exámenes de aguas, aguas negras y desechos industriales]]></source>
<year>1955</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[División de Salubridad, Bienestar y Habitación, Instituto de Asuntos Internacionales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Artiole]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Fuller]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Effect of chromium attenuation in soils]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1979</year>
<volume>8</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>503-509</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Aubert]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Pinta]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Trace elements in soils; development in soil science]]></source>
<year>1980</year>
<edition>7</edition>
<publisher-loc><![CDATA[New York ]]></publisher-loc>
<publisher-name><![CDATA[Elsevier]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Báez Pedrajo]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[Irma Rosa]]></given-names>
</name>
<name>
<surname><![CDATA[Belmont Dávila]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
</person-group>
<article-title xml:lang="es"><![CDATA[Determinación de cromo en dos poblaciones humanas no ocupacionalmente expuestas]]></article-title>
<source><![CDATA[An. Inst. Biol. Ser. Biol. Exp.]]></source>
<year>1977</year>
<volume>48</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>77-93</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barnett]]></surname>
<given-names><![CDATA[Vic]]></given-names>
</name>
</person-group>
<source><![CDATA[Elements of sampling theory]]></source>
<year>1984</year>
<publisher-loc><![CDATA[London ]]></publisher-loc>
<publisher-name><![CDATA[Hodder Stoushton]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bartlett]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of chromium in soils: III Oxidation]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1979</year>
<volume>8</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>31-34</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bartlett]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of chromium in soils: II Hexavalent forms]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1976</year>
<volume>5</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>283-386</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bartlett]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kimble]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of chromium in soils: I trivalent forms]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1976</year>
<volume>5</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>379-382</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Batley]]></surname>
<given-names><![CDATA[F.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Gardner]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Sampling and storage of natural waters for trace metal analysis]]></article-title>
<source><![CDATA[Water research]]></source>
<year>1977</year>
<volume>11</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>745-756</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Black]]></surname>
<given-names><![CDATA[C.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Methods of Soil Analysis]]></source>
<year>1965</year>
<publisher-loc><![CDATA[Madison^eWisconsin Wisconsin]]></publisher-loc>
<publisher-name><![CDATA[American Society of Agronomy]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chapman]]></surname>
<given-names><![CDATA[H.D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Diagnostic criteria for plants and soils]]></source>
<year>1965</year>
<publisher-loc><![CDATA[Riverside^eCal Cal]]></publisher-loc>
<publisher-name><![CDATA[Department of Soils and Plant Nutrition, University of California]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<collab>Departamento del Distrito Federal</collab>
<source><![CDATA[Memoria de las obras del sistema de drenaje profundo del Distrito Federal]]></source>
<year>1975</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Talleres Gráficos de la Nación]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<collab>Federal Security Agency</collab>
<source><![CDATA[Health of workers in chromate producing industry]]></source>
<year>1953</year>
<publisher-loc><![CDATA[Washington^eD.C. D.C.]]></publisher-loc>
<publisher-name><![CDATA[Public Health Service Publications]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez Arroyo]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<name>
<surname><![CDATA[Villalobos Pietrini]]></surname>
<given-names><![CDATA[Rafael]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Chromosoma alterations induced by some chromium salts]]></article-title>
<source><![CDATA[Cytologia]]></source>
<year>1983</year>
<volume>48</volume>
<page-range>185-193</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gutiérrez Ruíz]]></surname>
<given-names><![CDATA[Margarita Eugenia]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio del contenido de iones inorgánicos y sus interacciones en suelos y plantas de los distritos de riego 03 y 88. México]]></source>
<year>1982</year>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jackson]]></surname>
<given-names><![CDATA[M.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis químico de suelos]]></source>
<year>1954</year>
<publisher-loc><![CDATA[Barcelona ]]></publisher-loc>
<publisher-name><![CDATA[Omega]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[James]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Bartlett]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of chromium in soils. VI. Interaction between oxidation, reduction and organic complexation]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1983</year>
<volume>12</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>173-176</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[James]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of chromium in soils. VII. Adsortion and reduction of hexavalent forms]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1983</year>
<volume>12</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>177-180</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kirk]]></surname>
</name>
<name>
<surname><![CDATA[Othmer]]></surname>
</name>
</person-group>
<source><![CDATA[Encyclopedia of chemical technology]]></source>
<year>1979</year>
<edition>3</edition>
<page-range>54-56</page-range><publisher-loc><![CDATA[New York ]]></publisher-loc>
<publisher-name><![CDATA[J. Wiley. V.G.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="">
<collab>National Research Council</collab>
<article-title xml:lang="en"><![CDATA[Associate committe on Scientific Criteria for Environmental Quality]]></article-title>
<source><![CDATA[Effects of chromium in the candian environmental]]></source>
<year>1976</year>
<publisher-loc><![CDATA[Otawa ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Purves]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Trace elements contamination of the environment]]></source>
<year>1977</year>
<publisher-loc><![CDATA[Amsterdam ]]></publisher-loc>
<publisher-name><![CDATA[Elsevier]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rosas Pérez]]></surname>
<given-names><![CDATA[Irma]]></given-names>
</name>
</person-group>
<source><![CDATA[Aspectos ecotoxicológicos del cromo en una zona industrial del estado de México]]></source>
<year>1984</year>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rosas Pérez]]></surname>
<given-names><![CDATA[Irma]]></given-names>
</name>
<name>
<surname><![CDATA[Baéz Pedrajo]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<name>
<surname><![CDATA[Belmont Dávila]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
</person-group>
<article-title xml:lang="es"><![CDATA[Cuantificación de cromo en el suelo y vegetales de una zona contaminada por cromo residual de origen industrial]]></article-title>
<source><![CDATA[An. Inst. Biol. ser. Biol. Exp.]]></source>
<year>1977</year>
<volume>48</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>95-112</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ross]]></surname>
<given-names><![CDATA[D.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Sjogren]]></surname>
<given-names><![CDATA[R.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Bartlett]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Behavior of Chromium in soils: IV. Toxicity to microorganisms]]></article-title>
<source><![CDATA[Journal of Environmental Quality]]></source>
<year>1981</year>
<volume>10</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>145-148</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="">
<collab>Secretaría de Educación, Cultura y Bienestar Social del Estado de México. S.A.</collab>
<source><![CDATA[Resumen del asunto relativo a la industria Cromatos de México, S.A. México]]></source>
<year></year>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<collab>Secretaría de Recursos Hidráulicos^dComisión Hidrológica de la Cuenca del Valle de México</collab>
<source><![CDATA[Estudio geoquímico de las aguas subterráneas en el valle de Cuautitlán]]></source>
<year>1961</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<collab>Secretaría de Recursos Hidráulicos^dComisión Hidrológica de la Cuenca del Valle de México</collab>
<source><![CDATA[Hidrogeología del valle de Cuautitlán]]></source>
<year>1961</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<collab>Servicios Geofísicos</collab>
<source><![CDATA[Estudio hidrogeológico y geofísico de la zona de Cuautitlán]]></source>
<year>1966</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tristán]]></surname>
<given-names><![CDATA[L.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio general del proyecto: Sulfato de aluminio reciclado de los desechos de la planta Cromatos de México, S.A.]]></source>
<year>1984</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[CINADI]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Valverde Valverde]]></surname>
<given-names><![CDATA[Carmen]]></given-names>
</name>
<name>
<surname><![CDATA[Aguilar Martínez]]></surname>
<given-names><![CDATA[Adrían Guillermo]]></given-names>
</name>
<name>
<surname><![CDATA[García Amaral]]></surname>
<given-names><![CDATA[Ma. Luisa]]></given-names>
</name>
</person-group>
<source><![CDATA[Geografía urbana del municipio de Tultitlán, estado de México]]></source>
<year>1980</year>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
