<?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>S0187-57792012000200111</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Relación del nitrato sobre la contaminación bacteriana del agua]]></article-title>
<article-title xml:lang="en"><![CDATA[Nitrate and bacterial contamination in water]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gauna]]></surname>
<given-names><![CDATA[Luciana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Gloria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo]]></surname>
<given-names><![CDATA[Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[Cesar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional del Nordeste Facultad de Ciencias Agrarias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<fpage>111</fpage>
<lpage>119</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-57792012000200111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-57792012000200111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-57792012000200111&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La contaminación de aguas subterráneas con nitrato constituye uno de los mayores problemas a nivel mundial. En Argentina, concentraciones mayores a 45 mg L-1 son potencialmente peligrosas y se han encontrado en aguas para consumo humano, concentraciones mayores a dicho umbral. Hay antecedentes que mencionan la existencia de una relación entre las concentraciones de este ión y la proliferación de bacterias. Para determinar la capacidad indicativa del nitrato en la contaminación bacteriana de aguas en distintas fuentes de agua de Itatí, Corrientes, Argentina, se seleccionaron doce puntos de muestreo. Se efectuaron, quincenalmente, durante siete meses, análisis físico-químicos y bacteriológicos. Las concentraciones de nitrato se determinaron por espectrofotometría de absorción molecular, el recuento de bacterias coliformes se realizó mediante técnica del número más probable (NMP) en caldo Mac Conkey y confirmación de positivos con caldo Brilla a 37 °C, las coliformes fecales se determinaron a partir de los positivos de la fase presuntiva y las coliformes no fecales por siembra en citrato de Koser. Los datos fueron sometidos a un análisis de estadística descriptiva. Las relaciones entre los parámetros estudiados fueron analizadas mediante correlación de Pearson empleando programa estadístico Infostat. Las concentraciones de nitrato en el agua superficial no superaron los 4 mg L-1, en todos los puntos de muestreo mientras que en las perforaciones los valores oscilaron entre 0.05 a 36 mg L-1 y en los pozos entre 0.32 y 37 mg L-1. La mayor cantidad de coliformes totales detectadas, corresponden a las muestras de agua de pozo y laguna. Tanto en aguas superficiales como subterráneas se encontraron coliformes fecales. Se encontraron correlaciones negativas significativamente entre nitrato y coliformes totales y nitrato y coliformes no fecales. El origen de la contaminación puede atribuirse a fuentes localizadas y no a la actividad agrícola.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Groundwater nitrate pollution is one of the most serious problems worldwide. In Argentina, concentrations over 45 mg L-1 are potentially dangerous, and concentrations above this threshold were found in drinking water. Moreover, many papers mention a relationship between the concentration of this ion and the proliferation of bacteria. In order to determine whether nitrate concentration as indicative of bacterial water contamination, in different water sources in Itatí, Corrientes, Argentina, twelve sampling points were selected. Every fifteen days for seven months, physicochemical and bacteriological analyses were conducted with samples. Nitrate concentrations, expressed as mg L-1 were determined by molecular absorption spectrophotometry and the most probable number (MNP) technique was used for counting coliform bacteria. The presence of bacteria was determined using Mac Conkey medium (screening) and were confirmed with Brilla medium at 37 °C. Additionally, the presence of fecal coliforms was determined from the positives of the screening phase (total coliforms) and no fecal coliforms with Koser citrate medium. Data were subjected to an analysis of descriptive statistics and relationships among the studied parameters were analyzed by Pearson correlation using Infostat Software. Nitrate concentrations in surface water had low values below 4 mg L-1 in all sampling sites, while values ranged from 0.05 to 36 mg L-1 for drilling and between 0.32 and 37 mg L-1 for wells. Regarding bacterial load, the highest count of total coliforms was detected in well water and lagoon samples; however, fecal coliforms were detected in surface water and groundwater. Only significant negative correlations were found between nitrate and total coliforms and nitrate and fecal coliforms. The origin of pollution can be attributed point sources and non-agricultural activity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[polución]]></kwd>
<kwd lng="es"><![CDATA[monitoreo]]></kwd>
<kwd lng="es"><![CDATA[muestreo]]></kwd>
<kwd lng="es"><![CDATA[acuífero]]></kwd>
<kwd lng="es"><![CDATA[correlación]]></kwd>
<kwd lng="en"><![CDATA[pollution]]></kwd>
<kwd lng="en"><![CDATA[monitoring]]></kwd>
<kwd lng="en"><![CDATA[sampler]]></kwd>
<kwd lng="en"><![CDATA[aquifer]]></kwd>
<kwd lng="en"><![CDATA[correlation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Antón]]></surname>
<given-names><![CDATA[Almudena]]></given-names>
</name>
<name>
<surname><![CDATA[Lizaso]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Nitritos, nitratos y nitrosaminas]]></source>
<year>2001</year>
<publisher-loc><![CDATA[Madrid, España ]]></publisher-loc>
<publisher-name><![CDATA[Fundación Ibérica para la Seguridad Alimentaria]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="confpro">
<collab>APHA</collab>
<source><![CDATA[]]></source>
<year>2005</year>
<conf-name><![CDATA[ 133rdAnnual Meeting and Exposition in Philadelphia]]></conf-name>
<conf-loc>Philadelphia, PA, USA </conf-loc>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Auge]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Deterioro de acuíferos por sobreexplotación y contaminación]]></source>
<year>1997</year>
<conf-name><![CDATA[ Congreso Internacional sobre Aguas, Conferencia Plenaria]]></conf-name>
<conf-loc> </conf-loc>
<publisher-loc><![CDATA[Buenos Aires, Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Universidad de Buenos Aires]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Calidad de agua para consumo humano y riego en muestras del cinturón hortícola de Mar del Plata]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baccaro]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Degorgue]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Lucca]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Picone]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Zamuner]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Andreoli]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Rev. Inv. Agrop.]]></source>
<year>2006</year>
<volume>35</volume>
<page-range>95-110</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bianucci]]></surname>
<given-names><![CDATA[S. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Ruberto]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Depettris]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Clemente]]></surname>
<given-names><![CDATA[M. T.]]></given-names>
</name>
</person-group>
<source><![CDATA[Aplicación de indicadores de impacto ambiental al estudio de calidad de aguas continentales: caso de la laguna Los Lirios, Resistencia, Argentina]]></source>
<year>2005</year>
<publisher-loc><![CDATA[Chaco, Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Nacional del Nordeste]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<collab>CAA</collab>
<source><![CDATA[Capítulo XII, Bebidas hídricas, agua y agua gasificada. Agua potable]]></source>
<year>2007</year>
<publisher-loc><![CDATA[República Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Ministerio de Salud y Acción Social]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Nitrate contamination of a rural aquifer and accumulation in the unsaturated zone]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Massone]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Suero]]></surname>
<given-names><![CDATA[E. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Vidal]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bedmar]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Agric. Water Manage.]]></source>
<year>2002</year>
<volume>57</volume>
<page-range>33-47</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Bacteriological quality of runoff water from pastureland]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Doran]]></surname>
<given-names><![CDATA[J. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Linn]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Appl. Environ. Microbiol.]]></source>
<year>1979</year>
<volume>37</volume>
<page-range>985-91</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Fecal bacteria in the waters and upland area in Derbyshire, England: The influence of agricultural land use]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hunter]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Perkins]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Tranter]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Harwick]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual]]></source>
<year>2000</year>
<volume>29</volume>
<page-range>1253-61</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<collab>Infostat/P</collab>
<source><![CDATA[Software estadístico InfoStat]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Grupo Infostat]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[The effect of cattle grazing on indicator bacteria in runoff from a pacific northwest watershed]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jawson]]></surname>
<given-names><![CDATA[M. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Elliott]]></surname>
<given-names><![CDATA[L. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Saxton]]></surname>
<given-names><![CDATA[K. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Fortier]]></surname>
<given-names><![CDATA[D. H.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual.]]></source>
<year>1982</year>
<volume>11</volume>
<page-range>621-7</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Madigan]]></surname>
<given-names><![CDATA[M. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Martinko]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Brock]]></surname>
<given-names><![CDATA[T. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Parker]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Brock. Biología de los microorganismos]]></source>
<year>2004</year>
<publisher-loc><![CDATA[Madrid, España ]]></publisher-loc>
<publisher-name><![CDATA[Pearson]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[D. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Contaminación del agua subterránea por actividades agrícolas en el sudeste bonaerense]]></source>
<year>1995</year>
<publisher-loc><![CDATA[Mar del Plata, Argentina ]]></publisher-loc>
<publisher-name><![CDATA[Centro de Geología de Costas y Cuaternario. Universidad Nacional de Mar del Plata (UNMdP)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mazzeo]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Kruk]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Meerhoff]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Quintans]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Lacerot]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Gorga]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Loureiro]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Scharf]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Larrea]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación de la calidad del agua de la Laguna Blanca: sus causas y respuestas]]></source>
<year>2001</year>
<publisher-loc><![CDATA[Montevideo, Uruguay ]]></publisher-loc>
<publisher-name><![CDATA[Facultad de Ciencias]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Die bestimmung des nitrats in wasser. Jahrb. Wasserchem. Wasserreinigungstechnik]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Müller]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Wiedemann]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Verlag Chemie]]></source>
<year>1955</year>
<volume>12</volume>
<page-range>247-71</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<collab>OMS</collab>
<source><![CDATA[Guías para la calidad del agua potable. Recomendaciones]]></source>
<year>2006</year>
<page-range>Ginebra- Suiza</page-range><publisher-name><![CDATA[OMS]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Contaminación de aguas subterráneas con nitratos y coliformes en el litoral sudoeste del Uruguay]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Perdomo]]></surname>
<given-names><![CDATA[C. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Casanova]]></surname>
<given-names><![CDATA[O. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Ciganda]]></surname>
<given-names><![CDATA[V. S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Agrociencia]]></source>
<year>2001</year>
<volume>1</volume>
<page-range>10-22</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Evaluación de nitratos y bacterias coliformes en pozos de la cuenca alta del arroyo pantanoso (Bs. As.)]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Picone]]></surname>
<given-names><![CDATA[L. I.]]></given-names>
</name>
<name>
<surname><![CDATA[Andreoli]]></surname>
<given-names><![CDATA[Y. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Aparicio]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Crespo]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Nanninni]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Tambasio]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Rev. Invest. Agrop.]]></source>
<year>2003</year>
<volume>32</volume>
<page-range>99-110</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Well water quality, well vulnerability, and agricultural contamination in the midwestern United Sates]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Richards]]></surname>
<given-names><![CDATA[R. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Baker]]></surname>
<given-names><![CDATA[D. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Creamer]]></surname>
<given-names><![CDATA[N. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Kramer]]></surname>
<given-names><![CDATA[J. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Ewing]]></surname>
<given-names><![CDATA[D. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Merryfield]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Wallrabenstein]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual.]]></source>
<year>1996</year>
<volume>25</volume>
<page-range>384-402</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodier]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis de aguas]]></source>
<year>1981</year>
<publisher-loc><![CDATA[Barcelona, España ]]></publisher-loc>
<publisher-name><![CDATA[Omega]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rose]]></surname>
<given-names><![CDATA[J. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Grimes]]></surname>
<given-names><![CDATA[D. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Revaluation of microbial water quality: Powerful new tools for detection and risk assessment]]></source>
<year>2001</year>
<publisher-loc><![CDATA[Washington, DC, USA ]]></publisher-loc>
<publisher-name><![CDATA[American Academy of Microbiology]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Presencia en el agua de bebida de nitratos y nitritos y su impacto sobre la salud]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ryczel]]></surname>
<given-names><![CDATA[M. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[ATA-informa]]></source>
<year>2006</year>
<volume>71</volume>
<page-range>24-6</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sasson]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[La alimentación del hombre del mañana]]></source>
<year>1993</year>
<publisher-loc><![CDATA[Barcelona, España ]]></publisher-loc>
<publisher-name><![CDATA[UNESCO]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Occurrence of nitrate in groundwater. A review]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Spalding]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Exner]]></surname>
<given-names><![CDATA[M. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual.]]></source>
<year>1993</year>
<volume>22</volume>
<page-range>392-402</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Effect of sewage effluent on microbial activities and coliform populations of Pahokee Muck]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tate]]></surname>
<given-names><![CDATA[R. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Terry]]></surname>
<given-names><![CDATA[R. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual.]]></source>
<year>1980</year>
<volume>9</volume>
<page-range>673-7</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Fecal coliform release patterns from fecal materials of cattle]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Thelin]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Gifford]]></surname>
<given-names><![CDATA[G. F.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Qual.]]></source>
<year>1983</year>
<volume>12</volume>
<page-range>57-63</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Turco]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Coliform bacteria]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Weaver]]></surname>
<given-names><![CDATA[R. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Angle]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bottomley]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Bezdicek]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Tabatabai]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wollum]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Mickelson]]></surname>
<given-names><![CDATA[S. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Bigham]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Methods of soil analysis. Part 2. Microbiological and biochemical properties]]></source>
<year>1994</year>
<page-range>145-58</page-range><publisher-loc><![CDATA[Madison, WI, USA ]]></publisher-loc>
<publisher-name><![CDATA[SSSA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Human alteration of the global nitrogen cycle: Sources and consequences]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vitousek]]></surname>
<given-names><![CDATA[P. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Aber]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Howarth]]></surname>
<given-names><![CDATA[R. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Likens]]></surname>
<given-names><![CDATA[G. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Matson]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Schindler]]></surname>
<given-names><![CDATA[D. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Schlensinger]]></surname>
<given-names><![CDATA[W. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Tilman]]></surname>
<given-names><![CDATA[G. D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ecol. Applic.]]></source>
<year>1997</year>
<volume>7</volume>
<page-range>737-50</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
