<?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>S0188-49992018000400651</article-id>
<article-id pub-id-type="doi">10.20937/rica.2018.34.04.08</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[ANÁLISIS DE TENDENCIAS DE VARIABLES INDICADORAS DE CALIDAD DE AGUA PARA EL RIACHUELO (CUENCA MATANZA-RIACHUELO, ARGENTINA)]]></article-title>
<article-title xml:lang="en"><![CDATA[TREND ANALYSIS OF WATER QUALITY MONITORING DATA FOR EL RIACHUELO (MATANZA-RIACHUELO BASIN, ARGENTINA)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Casares]]></surname>
<given-names><![CDATA[María Victoria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabo]]></surname>
<given-names><![CDATA[Laura Isabel de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Museo Argentino de Ciencias Naturales Bernardino Rivadavia  ]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>34</volume>
<numero>4</numero>
<fpage>651</fpage>
<lpage>665</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992018000400651&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992018000400651&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992018000400651&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El río Matanza-Riachuelo constituye un ejemplo claro y extremo del &#8220;síndrome del río urbano&#8221; y un caso emblemático de contaminación en Argentina. A partir de los datos generados en el monitoreo de la calidad de agua superficial del Riachuelo (tramo inferior del río Matanza) que realiza la Agencia de Protección Ambiental del Gobierno de la Ciudad de Buenos Aires, se evaluó la evolución de la calidad del agua (periodo 2008-2016). Para ello, se aplicó la prueba estadística de Mann-Kendall a la serie de datos para cinco variables fisicoquímicas, una microbiológica y la precipitación acumulada mensual para el área. Los resultados reflejaron condiciones más favorables en cuanto a contenido y demanda biológica de oxígeno, nitrógeno amoniacal total y ion cloruro aguas arriba de la desembocadura. La abundancia de bacterias Escherichia coli no mostró una tendencia apreciable. Asimismo, la fracción de materia orgánica no biodegradable se habría incrementado en todo el tramo al igual que la precipitación acumulada mensual para el periodo estudiado. El incremento de la escorrentía pluvial habría determinado las tendencias observadas en el intervalo de tiempo considerado. Aun así, el ecosistema permaneció en un estado altamente degradado con el 50 % de los valores registrados de oxígeno disuelto por debajo de 2 mg/L y el 50 % de los valores de demanda biológica y demanda química de oxígeno por encima de 15 y 50 mg O2/L, respectivamente. Los números de E. coli, por su parte, resultaron similares a los de un efluente cloacal crudo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Matanza-Riachuelo river is a clear and extreme example of the &#8220;urban river syndrome&#8221; and an emblematic case of environmental pollution in Argentina. Analysis of water quality data trends for the Riachuelo (in the Matanza-Riachuelo river lower basin) was performed by using water quality monitoring data generated by the Environmental Protection Agency of the Buenos Aires City Government. Data was collected in three monitoring points along the river from 2008 to 2016. The Mann-Kendall non-parametric statistical test was applied to the time series available for six parameters, five physicochemical and one microbiological, and the monthly rainfall data for the Buenos Aires City area. Trend analysis showed an improvement in the quality of Riachuelo&#8217;s surface water, reflected by increasing levels in dissolved oxygen (upstream the river mouth) and decreasing levels in biological oxygen demand, total ammonia nitrogen and chloride. Non-biodegradable organic matter, in contrast, showed an increasing trend. Monthly rainfall also experienced an increment while Escherichia coli numbers did not show a defined pattern. Increasing stormwater runoff may have determined the trends observed in the time period considered. Nonetheless, the quality of Riachuelo&#8217;s water remained severely degraded with 50 % of the dissolved oxygen, and biological and chemical oxygen demands values below 2 mg/L and above 15 and 50 mg O2/L, respectively. E. coli numbers were similar to those recorded in raw sewage.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[río urbano]]></kwd>
<kwd lng="es"><![CDATA[contaminación]]></kwd>
<kwd lng="es"><![CDATA[efluentes]]></kwd>
<kwd lng="es"><![CDATA[escorrentía pluvial]]></kwd>
<kwd lng="en"><![CDATA[urban river]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[sewage]]></kwd>
<kwd lng="en"><![CDATA[stormwater runoff]]></kwd>
</kwd-group>
</article-meta>
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