<?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>0187-5779</journal-id>
<journal-title><![CDATA[Terra Latinoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Terra Latinoam]]></abbrev-journal-title>
<issn>0187-5779</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de la Ciencia del Suelo A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-57792020000300361</article-id>
<article-id pub-id-type="doi">10.28940/terra.v38i2.610</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Indicadores de calidad físico-química de las aguas residuales del estado de Oaxaca, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Quality indicators physical chemistry of wastewater of state Oaxaca, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Ballesteros]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Escobar]]></surname>
<given-names><![CDATA[Héctor Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Bernal]]></surname>
<given-names><![CDATA[Edgar Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Can-Chulim]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,aff1  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad del Mar Departamento de Ecología ]]></institution>
<addr-line><![CDATA[Pochutla Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Nayarit  ]]></institution>
<addr-line><![CDATA[Xalisco Nayarit]]></addr-line>
<country>Mexico</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>38</volume>
<numero>2</numero>
<fpage>361</fpage>
<lpage>375</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792020000300361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792020000300361&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792020000300361&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El estado de Oaxaca posee un sistema hidrológico extenso y complejo, debido a su variación en la disponibilidad regional y temporal. Además, el crecimiento poblacional e industrial han incrementado la descarga de aguas residuales degradando así su calidad. El volumen permitido de aguas residuales que se pueden transferir a los cauces en el estado es de 0.35 m3 s-1; sin embargo, existen descargas ilegales que elevan las concentraciones iónicas; dichas aguas son utilizadas para el riego agrícola desde su origen hasta su desembocadura. Con la finalidad de evaluar cuantitativamente los parámetros sobre las concentraciones iónicas de las aguas residuales para su aplicación en los suelos agrícolas, se establecieron 89 estaciones de muestreo en el verano de 2018 a lo largo del estado. La calidad del agua se clasificó de acuerdo con su conductividad eléctrica (CE), relación de adsorción de sodio (RAS), carbonato de sodio residual (CSR) y concentraciones de boro y fósforo. El coeficiente mg L-1 = af (CE) fue de a = 0.671, este valor a corresponde al tipo de agua de composición SO4&#8209;Cl&#8209;HCO3. El pH fue de 6.98&#8209;7.54&#8209;8.32; la CE fluctuó entre 80-2550 µS cm-1 con un promedio de 475 µS&#8209;cm-1. El contenido de Na2CO3 es de (-0.34)&#8209;0.74&#8209;8.10 mmolc L&#8209;1. El coeficiente de la relación funcional µ (M L-1) = af (CE) fue de a = 0.0117. Los valores de la RAS original, ajustado y corregido fueron: RASor 0.27-1.82-11.54, RASaj 0.05-2.76&#8209;23.51 y RAScorr 0.18-1.87-12.66 respectivamente. Para conocer el peligro potencial de sodicidad se calcularon los valores de la relación PSI-RAS y se obtuvo que en RASor = 16.32, RASaj= 28.43, RAScorr = 17.63. De conformidad con los parámetros físico-químicos las aguas residuales de Oaxaca son sulfático-clorhídrico-bicarbonatadas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary: The state of Oaxaca has an extensive and complex hydrological system due to its variation in regional and temporal availability. In addition, the human population and industrial growth have increased the discharge of wastewater, degrading its quality. The volume of wastewater that is allowed to be transferred into the channels of the State is 0.35 m3 s-1; however, there are illegal discharges that increase the ionic concentrations; these waters are used for agricultural irrigation from its source to its mouth. In order to quantitatively assess the parameters over ionic concentrations of wastewater to be applied in agricultural soils, 89 sampling stations were established in the summer of 2018 along the State. The water quality was classified according to its electrical conductivity (EC), sodium adsorption ratio (RAS), residual sodium carbonate (CSR), and concentration of boron and phosphorus. The coefficient of mg L-1 = af (EC) was a = 0.671, this value a corresponds to the type of water of SO4&#8209;Cl&#8209;HCO3 composition. The pH was 6.98-7.54-8.32; the EC fluctuated between 80 and 2550 µS cm-1 with an average value of 475 &#956;S cm-1. The content of Na2CO3 is (-0.34) -0.74-8.10 mmolc L-1. The coefficient of the functional relationship &#956; (M L&#8209;1) = af (EC) was a = 0.0117. The values of original, adjusted and corrected RAS were: RASor 0.27-1.82-11.54, RASaj 0.05-2.76-23.51 and RAScorr 0.18-1.87-12.66, respectively. To determine the potential danger of sodicity, PSI-RAS relationship values were calculated, resulting in RASor = 16.32, RASaj = 28.43, RAScorr = 17.63. In accordance with the physical-chemical parameters, the wastewaters from Oaxaca are sulphatic-hydrochloric-bicarbonated.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[boro]]></kwd>
<kwd lng="es"><![CDATA[CE]]></kwd>
<kwd lng="es"><![CDATA[CSR]]></kwd>
<kwd lng="es"><![CDATA[fósforo]]></kwd>
<kwd lng="es"><![CDATA[RAS]]></kwd>
<kwd lng="en"><![CDATA[boron]]></kwd>
<kwd lng="en"><![CDATA[EC]]></kwd>
<kwd lng="en"><![CDATA[RSC]]></kwd>
<kwd lng="en"><![CDATA[phosphorus]]></kwd>
<kwd lng="en"><![CDATA[SAR]]></kwd>
</kwd-group>
</article-meta>
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