<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082024000100131</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.1948</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Arsenic geochemical species modeling, prediction, and bioavailability in groundwaters of the Oban Massif, southeastern Nigeria]]></article-title>
<article-title xml:lang="es"><![CDATA[Modelación, predicción y biodisponibilidad de especies geoquímicas de arsénico en aguas subterráneas del macizo de Oban, sureste de Nigeria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ekwere]]></surname>
<given-names><![CDATA[Azubuike S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Calabar Department of Geology ]]></institution>
<addr-line><![CDATA[Calabar ]]></addr-line>
<country>Nigeria</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2024</year>
</pub-date>
<volume>48</volume>
<numero>186</numero>
<fpage>131</fpage>
<lpage>144</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082024000100131&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082024000100131&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082024000100131&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract To ascertain the distribution patterns, source identification, chemical speciation, and bioavailability of arsenic in basement aquifers, 64 groundwater samples were analyzed using hydrochemical and geochemical modeling. It was determined that important ion geochemistry, hydrogeochemical facies, and basic hydrogeochemical parameters are interdependent. Arsenic (As) concentrations varied from 0.001 mg/l to 0.03 mg/l, with a mean of 0.007 mg/l. The results of 4.68% of samples were higher than the allowable level of 0.01 mg/l, i.e., groundwater arsenic levels are not dangerous. Significant ion concentrations decreased from dry to rainy seasons suggesting that ionic concentrations generated by silicate weathering in aquifers became diluted. Abundance trends in metal concentration during the dry and rainy seasons were Fe &gt; Mn &gt; Zn &gt; Ni &gt; Cu &gt; As &gt; Pb &gt; Cd and Fe &gt; Zn &gt; Mn &gt; Ni &gt; Pb &gt; Cu &gt; As &gt; Cd, respectively. Of the two hydrochemical facies discovered, the predominant one was the main alkaline-earth-bicarbonate facies [Ca-(Mg)-HCO3] typical of basement terrains, suggesting the fundamental stage of groundwater evolution. Plots of ionic ratios, metal loads, and principal component analyses showed that ionic concentrations are controlled by geology. Geochemical modeling revealed the presence of aqueous arsenic species, which are the less dangerous arsenates at unsaturated levels and do not currently pose a concern.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Para determinar los patrones de distribución, las fuentes, la especiación química y la biodisponibilidad de arsénico en acuíferos subterráneos, se analizaron 64 muestras de agua subterránea mediante modelos hidroquímicos y geoquímicos. Se determinó que la geoquímica iónica de importancia, las facies hidrogeoquímicas y los parámetros hidrogeoquímicos básicos son interdependientes. Las concentraciones de arsénico (As) variaron de 0,001 mg/l a 0,03 mg/l, con una media de 0,007 mg/l. Los resultados del 4,68 % de las muestras sobrepasaron el nivel permitido de 0,01 mg/l, lo que significa que el agua subterránea no tiene un contenido peligrosamente alto de arsénico. Las concentraciones significativas de iones en las estaciones secas disminuyeron en las lluviosas, lo que sugiere que las concentraciones iónicas, generadas por la erosión de silicatos en los acuíferos, se diluyeron. La tendencia de la abundancia en la concentración de metales fue Fe &gt; Mn &gt; Zn &gt; Ni &gt; Cu &gt; As &gt; Pb &gt; Cd durante la estación seca y Fe &gt; Zn &gt; Mn &gt; Ni &gt; Pb &gt; Cu &gt; As &gt; Cd durante la lluviosa. De las dos facies hidroquímicas descubiertas, la predominante fue la facies principal de bicarbonato alcalinotérreo [Ca-(Mg)-HCO3], típica de terrenos de basamento, lo que sugiere la etapa fundamental de la evolución del agua subterránea. Los gráficos de proporciones iónicas, cargas metálicas y análisis de componentes principales evidenciaron que las concentraciones iónicas están controladas por la geología. Los modelos geoquímicos revelaron la presencia de especies acuosas de arsénico, es decir, los arseniatos menos peligrosos en niveles no saturados, por lo que actualmente no representan una preocupación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Arsenic]]></kwd>
<kwd lng="en"><![CDATA[Groundwater]]></kwd>
<kwd lng="en"><![CDATA[Speciation]]></kwd>
<kwd lng="en"><![CDATA[Basement]]></kwd>
<kwd lng="en"><![CDATA[Nigeria]]></kwd>
<kwd lng="es"><![CDATA[Arsénico]]></kwd>
<kwd lng="es"><![CDATA[Agua subterránea]]></kwd>
<kwd lng="es"><![CDATA[Especiación]]></kwd>
<kwd lng="es"><![CDATA[Basamento]]></kwd>
<kwd lng="es"><![CDATA[Nigeria]]></kwd>
</kwd-group>
</article-meta>
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