<?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>1794-4449</journal-id>
<journal-title><![CDATA[Revista Lasallista de Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Lasallista Investig.]]></abbrev-journal-title>
<issn>1794-4449</issn>
<publisher>
<publisher-name><![CDATA[Corporación Universitaria Lasallista]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1794-44492021000200144</article-id>
<article-id pub-id-type="doi">10.22507/rli.v18n2a11</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto Ecotoxicológico de la Mezcla de Aroclor 1254 y Plomo en el Bioindicador Daphnia magna]]></article-title>
<article-title xml:lang="en"><![CDATA[Ecotoxicological effect of the mixture of Aroclor 1254 and lead in the bioindicator Daphnia magna]]></article-title>
<article-title xml:lang="pt"><![CDATA[Efeito ecotoxicológico da mistura de aroclor 1254 e chumbo no bioindicador Daphnia magna]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dellafredad-Tesén]]></surname>
<given-names><![CDATA[Carlos Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Iannacone]]></surname>
<given-names><![CDATA[José Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Científica del Sur Facultad de Ingeniería ambiental ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Peru</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Científica del Sur Facultad de Ingeniería ambiental ]]></institution>
<addr-line><![CDATA[Lima ]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>18</volume>
<numero>2</numero>
<fpage>144</fpage>
<lpage>161</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1794-44492021000200144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1794-44492021000200144&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1794-44492021000200144&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: el bioensayo con la especie bioindicadora Daphnia magna Strauss, 1820 posibilita obtener el efecto ecotoxicológico agudo individual y en mezcla de diversos tóxicos químicos mediante la concentración letal media (CL50).  Objetivo: determinar el efecto ecotoxicológico de la mezcla de aroclor 1254 y del plomo (Pb2+) sobre D. magna.  Materiales y Métodos: se midió la CL50 siendo aroclor 1254 &gt; Pb2+, y ulteriormente la concentración sin efecto ecológico (PNEC) para el efecto individual y en mezcla. Se contrastaron los valores de PNEC con la categoría 4 - E1 (lagunas y lagos) y E2 (ríos) del Estándar de Calidad Ambiental Peruano (Decreto Supremo N° 004 2017-MINAM -Perú).  Resultados: los valores de CL50 disminuyeron de forma gradual a 48 h de exposición para ambos compuestos en forma individual y en mezcla. Se calculó la proporción - sinergia (PS) en relaciones de 1:1, 3:2 y 4:1 (aroclor 1254: Pb2+), obteniéndose mayores valores de PS en 3:2 y 4:1 en contrastación a 1:1.  Conclusiones: la concentración de aroclor 1254 estimada de PNEC es similar al valor de la conservación del ambiente acuático categoría 4 - E1 y E2, y la concentración máxima para Pb2+ no es adecuada y debe reducirse para fortalecer la conservación de la biota acuática. Finalmente, el bioindicador D. magna determinó idóneamente la mezcla de aroclor 1254 y Pb2+.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction: the bioassay with the bioindicator species Daphnia magna Strauss, 1820 makes it possible to obtain the individual acute ecotoxicological effect and in a mixture of various chemical toxics by means of the mean lethal concentration (LC50).  Objective: to determine the ecotoxicological effect of the mixture of aroclor 1254 and lead (Pb2+) on D. magna.  Materials and Methods: LC50 was measured with arochlor 1254&gt; Pb2+, and subsequently the concentration without ecological effect (PNEC) for the individual effect and as a mixture. PNEC values were contrasted with category 4-E1 (lagoons and lakes) and E2 (rivers) of the Peruvian Environmental Quality Standard (Supreme Decree No. 004 2017-MINAM-Peru).  Results: LC50 values gradually decreased after 48 h of exposure for both compounds individually and as a mixture. The proportion-synergy (PS) was calculated in ratios of 1:1, 3:2 and 4:1 (arochlor 1254: Pb2+), obtaining higher PS values in 3:2 and 4:1 in contrast to 1:1.  Conclusions: the PNEC estimated arochlor 1254 concentration is similar to the conservation value of the aquatic environment category 4-E1 and E2, and the maximum concentration for Pb2+ is not adequate and should be reduced to strengthen the conservation of aquatic biota. Finally, the bioindicator D. magna ideally determined the mixture of aroclor 1254 and Pb2+.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo  Introdução: o bioensaio com as espécies bioindicadoras Daphnia magna Strauss, 1820 permite obter o efeito ecotoxicológico agudo individual e numa mistura de várias toxinas químicas por meio da concentração letal média (CL50).  Objetivo: determinar o efeito ecotoxicológico da mistura de arocloro 1254 e chumbo (Pb2+) sobre D. magna.  Materiais e Métodos: a CL50 foi medida com arocloro 1254&gt;Pb2+, e posteriormente a concentração sem efeito ecológico (PNEC) para o efeito individual e como mistura. Os valores do PNEC foram contrastados com a categoria 4-E1 (lagoas e lagos) e E2 (rios) do Padrão de Qualidade Ambiental Peruano (Decreto Supremo n° 004 2017-MINAM-Peru).  Resultados: Os valores de LC50 diminuíram gradualmente após 48 h de exposição para ambos os compostos individualmente e como uma mistura. A proporção-sinergia (PS) foi calculada em proporções de 1:1, 3:2 e 4:1 (arocloro 1254: Pb2+), obtendo-se valores de PS mais altos em 3:2 e 4:1 em contraste com 1:1.  Conclusões: a concentração estimada de arocloro 1254 do PNEC é semelhante ao valor de conservação do ambiente aquático categoria 4-E1 e E2, e a concentração máxima de Pb2+ não é adequada e deve ser reduzida para fortalecer a conservação da biota aquática. Finalmente, o bioindicador D. magna determinou idealmente a mistura de arocloro 1254 e Pb2+.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Aroclor 1254]]></kwd>
<kwd lng="es"><![CDATA[bioensayo]]></kwd>
<kwd lng="es"><![CDATA[Daphnia magna]]></kwd>
<kwd lng="es"><![CDATA[plomo]]></kwd>
<kwd lng="en"><![CDATA[Arochlor 1254]]></kwd>
<kwd lng="en"><![CDATA[bioassay]]></kwd>
<kwd lng="en"><![CDATA[Daphnia magna]]></kwd>
<kwd lng="en"><![CDATA[lead]]></kwd>
<kwd lng="pt"><![CDATA[Aroclor 1254]]></kwd>
<kwd lng="pt"><![CDATA[bioensaio]]></kwd>
<kwd lng="pt"><![CDATA[Daphnia magna]]></kwd>
<kwd lng="pt"><![CDATA[chumbo]]></kwd>
</kwd-group>
</article-meta>
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