<?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>S0188-49992025000100112</article-id>
<article-id pub-id-type="doi">10.20937/rica.55142</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comparación de dos tratamientos pasivos para disminuir la concentración de metales pesados en drenaje ácido de minas: cálcico-magnésico y alofánico-magnésico]]></article-title>
<article-title xml:lang="en"><![CDATA[Comparison of two passive treatments to reduce the concentration of heavy metals in acid mine drainage: Calcium-magnesium and allophane-magnesium]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Collahuazo]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hermosa]]></surname>
<given-names><![CDATA[Paola]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrón]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Cynthia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Martínez]]></surname>
<given-names><![CDATA[Fredy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Investigación Geológico y Energético  ]]></institution>
<addr-line><![CDATA[Quito ]]></addr-line>
<country>Ecuador</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Servicio Geológico Mexicano  ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>41</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992025000100112&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992025000100112&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992025000100112&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El drenaje ácido de mina (DAM) es un desafío ambiental de la actividad minera que debe atenderse en el corto plazo. Este estudio compara a escala laboratorio la utilización de dos sistemas de tratamiento pasivo para DAM, con el objetivo de disminuir la concentración de elementos potencialmente tóxicos (EPT). El muestreo del DAM fue realizado en la microcuenca del río Santa Rosa, Ecuador. El tratamiento se llevó a cabo en dos sistemas con lechos combinado: un sistema cálcico-magnésico y un sistema alofánico-magnésico. El DAM fluyó a través de cada sistema durante 50 días. Durante el tratamiento se registró el pH, la conductividad eléctrica y el potencial redox; se cuantificaron los EPT mediante espectrometría de masas de plasma (ICP-MS) y se determinaron los sulfatos mediante espectrofotometría ultravioleta (UV). Inicialmente, el DAM tenía un pH de 2.4 y la concentración de As(0.7), Cu(2.5), Ni(0.4), Zn(10.2) (en mg/L) sobrepasaba los valores de referencia establecidos en la legislación ambiental ecuatoriana. Una vez tratado el DAM, en ambos sistemas se disminuyó la concentración de los EPT hasta abajo de los valores de referencia [As(0.05), Cu(0.02), Ni(0.02), Zn(0.18) (en mg/L)]. Asimismo, los resultados mostraron que no hay diferencias estadísticamente significativas entre ambos sistemas, lo que redituaría en la disminución de costos en el tratamiento del DAM debido a la disponibilidad de alófano en Ecuador. Finalmente, se encontró un incremento en la concentración de sulfatos en ambos tratamientos, lo que representa una desventaja y, al mismo tiempo, una futura línea de investigación de este trabajo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Acid mine drainage (AMD) is an environmental challenge of mining activity that must be addressed in the short term. This study compares, at a laboratory scale, the use of two passive treatment systems for AMD to reduce the concentration of potentially toxic elements (PTE). Sampling of AMD was carried out in the micro-watershed of the Santa Rosa River in Ecuador. The treatment was carried out in two systems with combined beds: a calcium-magnesium system and an allophanic-magnesium system. The ADM flowed through each system for 50 days. During treatment, pH, electrical conductivity, and redox potential were recorded; PTE was quantified by Plasma Mass Spectrometry (ICP-MS), and sulfates were determined by UV spectrophotometry. Initially, the AMD had a pH of 2.4, and the concentration of As(0.7), Cu(2.5), Ni(0.4), and Zn(10.2) (mg/L) exceeded the reference values established in the Ecuadorian environmental legislation. Once the AMD was treated, in both systems, the concentration of the PTEs decreased below the reference values [As(0.05), Cu(0.02), Ni(0.02), Zn(0.18) (mg/L)]. Also, the results showed no statistically significant differences between these two systems, which would result in lower costs in the treatment of AMD due to the availability of allophane in Ecuador. Finally, an increase in sulfate concentration was found in both treatments, which represents a disadvantage and, at the same time, a future line of research in this work.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[sustrato alcalino disperso]]></kwd>
<kwd lng="es"><![CDATA[elementos potencialmente tóxicos]]></kwd>
<kwd lng="es"><![CDATA[efluentes ácidos mineros]]></kwd>
<kwd lng="es"><![CDATA[agua de mina]]></kwd>
<kwd lng="en"><![CDATA[dispersed alkaline substrate]]></kwd>
<kwd lng="en"><![CDATA[potentially toxic elements]]></kwd>
<kwd lng="en"><![CDATA[acid mine effluents]]></kwd>
<kwd lng="en"><![CDATA[mine water]]></kwd>
</kwd-group>
</article-meta>
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