<?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>S0370-39082017000100071</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.396</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variaciones de la acidez durante la incubación de las muestras en pruebas de demanda biológica de oxígeno]]></article-title>
<article-title xml:lang="en"><![CDATA[Variations of acidity during incubation of samples in biological oxygen demand tests]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas-León]]></surname>
<given-names><![CDATA[Jorge Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wilches-Flórez]]></surname>
<given-names><![CDATA[Ángela María]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vanegas-Castillo]]></surname>
<given-names><![CDATA[Cindy Viviana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Distrital Francisco José de Caldas Facultad de Medio Ambiente y Recursos Naturales ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>41</volume>
<numero>158</numero>
<fpage>71</fpage>
<lpage>78</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082017000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082017000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082017000100071&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En este trabajo se estudiaron las relaciones existentes entre la demanda biológica de oxígeno (DBO) y las variaciones de la acidez producidas durante el proceso de metabolización aeróbica de las aguas residuales domésticas. En una primera fase del proyecto se utilizaron soluciones patrón de glucosa y ácido glutámico y, en una segunda, muestras provenientes de la corriente influente de la Planta de Tratamiento de Aguas Residuales El Salitre, de Bogotá, Colombia. Se utilizaron botellas comerciales de color ámbar y 500 ml de capacidad nominal para incubar las muestras; para la captura del bióxido de carbono generado por la metabolización aeróbica de la materia orgánica en la fase acuosa se empleó una solución tampón concentrada; posteriormente, se determinó la cantidad de CO2 generado durante la incubación de las muestras mediante titulación con una base fuerte. Se encontró que la DBO de las aguas residuales domésticas podía medirse cuantificando la acidez durante el metabolismo de la materia orgánica contenida con ventajas comparativas frente al método estándar de incubación durante cinco días. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We studied the relationship between biological oxygen demand (BOD) and changes in acidity produced during aerobic metabolism of domestic wastewater. In a first phase of the project we worked with standard glucose-glutamic acid solutions, and in the second one, with samples from the influent stream of El Salitre Wastewater Treatment Plant in Bogotá, Colombia. We used commercial amber bottles with a sample incubating nominal capacity of 500 ml; we captured the carbon dioxide generated by aerobic metabolism of the organic matter in the aqueous phase using a concentrated buffer, and, subsequently, we determined the amount of CO2 generated during sample incubation by titration with a strong base. We found that the BOD of domestic wastewater can be measured by quantifying the acidity produced during the metabolism of organic matter contents, with comparative advantages as compared to the standard method of five days incubation. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Demanda biológica de oxígeno]]></kwd>
<kwd lng="es"><![CDATA[Aguas residuales domésticas]]></kwd>
<kwd lng="es"><![CDATA[Calidad de aguas]]></kwd>
<kwd lng="es"><![CDATA[Análisis de aguas]]></kwd>
<kwd lng="es"><![CDATA[Acidez]]></kwd>
<kwd lng="en"><![CDATA[Biological oxygen demand]]></kwd>
<kwd lng="en"><![CDATA[Domestic wastewater]]></kwd>
<kwd lng="en"><![CDATA[Water quality]]></kwd>
<kwd lng="en"><![CDATA[Water analysis]]></kwd>
<kwd lng="en"><![CDATA[Acidity]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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