<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972021000300201</article-id>
<article-id pub-id-type="doi">10.24275/uam/izt/dcbs/hidro/2021v31n3/vargas</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variabilidad iónica en la red hidrográfica de Oaxaca, México: Alternativa gráfica y estadística multivariada]]></article-title>
<article-title xml:lang="en"><![CDATA[Ionic variability in the hydrographic network of Oaxaca, Mexico: multivariate graphic and statistical alternative]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Orozco]]></surname>
<given-names><![CDATA[Alejandra Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Ayala]]></surname>
<given-names><![CDATA[Carlos]]></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[Ramírez-Vázquez]]></surname>
<given-names><![CDATA[Elí]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad del Mar Instituto de Ecología ]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</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>31</volume>
<numero>3</numero>
<fpage>201</fpage>
<lpage>208</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972021000300201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972021000300201&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972021000300201&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Antecedentes:  Factores como la litología, la geomorfología, el clima y las actividades antropogénicas, causan variabilidad iónica del agua superficial, sub-superficial y subterránea. El estudio de dicha variabilidad permite conocer sus características hidroquímicas para su posterior uso o consumo. La interpretación de la variabilidad iónica se realiza mediante métodos gráficos, y en los últimos años se han integrado las estadísticas multivariadas a dichos análisis.  Objetivos:  Se desea obtener un análisis químico e identificar qué factores afectan el agua y demostrar que el complementar el diagrama de Piper con el análisis multivariado ayuda a obtener una mejor interpretación de resultados.  Métodos:  El presente trabajo se realizó en la red hidrográfica Oaxaca-Puebla, contemplando el complejo relieve y las heterogéneas condiciones de litología y clima, sobre todo en Oaxaca. Se colectaron 90 muestras en total, de las cuales tres se tomaron en salinas de Zapotitlán, Puebla y el resto en el estado de Oaxaca. Se empleó el diagrama triangular de Piper para la clasificación de las aguas y el análisis de componentes principales (ACP) para mejorar la interpretación.  Resultados:  El diagrama triangular permitió clasificar las aguas de la red hidrográfica en dos grandes grupos, bicarbonatadas cálcico-magnésicas y sulfatadas cálcicas-magnésicas, además de la separación de las aguas salinas. Por su parte, el ACP, además de mostrar los mismos grupos de aguas, permitió observar una mayor concentración de cloruro de sodio en el punto más alto de la salinera, en comparación con los otros dos que se tomaron en este sitio. Con el ACP se pudo clasificar el agua de la cuenca del río Copalita como bicarbonatada cálcica-magnésica, lo que coincide con estudios previos.  Conclusiones:  Finalmente, al complementar el diagrama triangular de Piper con el ACP, se mejoró la interpretación de la variabilidad iónica de la red hidrográfica Oaxaca-Puebla.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Background:  Factors such as lithology, geomorphology, climate and anthropogenic activities, cause ionic variability of surface, subsurface and underground water. The study of this variability allows to know its hydrochemical characteristics for its subsequent use. The interpretation of the ionic variability is carried out by mean of graphic methods, and multivariate statistics have been integrated into these analyses during the last few years.  Objective:  To perform a chemical analysis, to identify the factors affecting the water, and to prove that complementing the Piper diagram with a multivariate analysis helps to obtain a better interpretation of results.  Methods:  This work was carried out in the Oaxaca-Puebla hydrographic network, considering the complex relief and the heterogeneous lithological and climate conditions, especially in Oaxaca. A total of 90 samples were collected, three of which were taken in salt flats in Zapotitlán, Puebla and the rest of them in the state of Oaxaca. A Piper diagram was used for water classification, as well as the principal component analysis (PCA) to improve the interpretation of data.  Results:  The triangular diagram allowed to classify the waters of the hydrographic network into two large groups, calcium-magnesium bicarbonate, and calcium-magnesium sulfate, in addition to the separation of saline waters. The PCA, in addition to showing the same groups of waters, allowed to prove a higher concentration of sodium chloride at the highest point of the salt flat, as compared to the other two that were taken at this site. With the PCA, the water of the Copalita river basin could be classified as calcium-magnesium bicarbonate, coinciding with previous studies.  Conclusions:  By complementing a Piper diagram with a PCA, the interpretation of the ionic variability of the Oaxaca-Puebla hydrographic network improved.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[análisis estadístico]]></kwd>
<kwd lng="es"><![CDATA[composición química]]></kwd>
<kwd lng="es"><![CDATA[corrientes superficiales]]></kwd>
<kwd lng="es"><![CDATA[métodos gráficos]]></kwd>
<kwd lng="es"><![CDATA[sales solubles]]></kwd>
<kwd lng="en"><![CDATA[chemical composition]]></kwd>
<kwd lng="en"><![CDATA[graphical methods]]></kwd>
<kwd lng="en"><![CDATA[soluble salts]]></kwd>
<kwd lng="en"><![CDATA[surface currents]]></kwd>
<kwd lng="en"><![CDATA[statistic analysis]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ahamed]]></surname>
<given-names><![CDATA[A.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Loganathan]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Ananthakrishnan]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Ahmed]]></surname>
<given-names><![CDATA[J.K.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Asharf]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluation of graphical and multivariate statistical methods for classification and evaluation of groundwater in Alathur Block, Perambalur District, India]]></article-title>
<source><![CDATA[Applied Ecology and Environmental Research]]></source>
<year>2016</year>
<volume>15</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>105-16</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<collab>American Society for Testing and Materials</collab>
<source><![CDATA[Standard Test Method for Alkalinity in Brackish Water, Seawater, and Brines/ Designation: D3875-03]]></source>
<year>2002</year>
<page-range>4</page-range><publisher-loc><![CDATA[United States ]]></publisher-loc>
<publisher-name><![CDATA[ASTM International, West Conshohocken, PA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<collab>American Society for Testing and Materials</collab>
<source><![CDATA[Standard Test Methods for Calcium and Magnesium In Water/ Designation: D511-03]]></source>
<year>2003</year>
<page-range>9</page-range><publisher-loc><![CDATA[United States ]]></publisher-loc>
<publisher-name><![CDATA[ASTM International, West Conshohocken, PA]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anderson]]></surname>
<given-names><![CDATA[N.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Harriman]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ryves]]></surname>
<given-names><![CDATA[D.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Patrick]]></surname>
<given-names><![CDATA[S.T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Dominant factors controlling variability in the ionic composition of West Greenland lakes]]></article-title>
<source><![CDATA[Arctic, Antarctic, and Alpine Research]]></source>
<year>2001</year>
<volume>33</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>418-25</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Avilés]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Novi&#269;]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Clavero]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Niell]]></surname>
<given-names><![CDATA[F.X.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variabilidad iónica en el complejo fluvial formado por los ríos Pivka, Unica y Ljubljanica (Eslovenia)]]></article-title>
<source><![CDATA[Limnetica]]></source>
<year>2003</year>
<volume>22</volume>
<numero>1-2</numero>
<issue>1-2</issue>
<page-range>155-64</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baird]]></surname>
<given-names><![CDATA[R.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Eaton]]></surname>
<given-names><![CDATA[A.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Rice]]></surname>
<given-names><![CDATA[E.W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Standard methods for examination of water and wastewater]]></source>
<year>2017</year>
<edition>23</edition>
<page-range>1545</page-range><publisher-loc><![CDATA[Washington, D.C. USA ]]></publisher-loc>
<publisher-name><![CDATA[American Public Health Association/American Water Works Association/Water Environment Federation]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Belkhiri]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Boudoukha]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Mouni]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A multivariate statistical analysis of groundwater chemistry data]]></article-title>
<source><![CDATA[International Journal of Environmental Research]]></source>
<year>2011</year>
<volume>5</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>537-44</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Betancourt]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Suárez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Concepción]]></surname>
<given-names><![CDATA[R.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Herrera]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Tendencia de los componentes mayoritarios del agua de cuatro embalses en el Centro-Sur Cubano, durante un período de veinte años]]></article-title>
<source><![CDATA[Gestión Ambiental]]></source>
<year>2012</year>
<volume>23</volume>
<page-range>51-65</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Biglari]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Chavoshani]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Javan]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Hossein]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Geochemical study of groundwater conditions with special emphasis on fluoride concentration, Iran]]></article-title>
<source><![CDATA[Desalination and Water Treatment]]></source>
<year>2015</year>
<volume>57</volume>
<numero>47</numero>
<issue>47</issue>
<page-range>22392-9</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[B.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[H.M.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[E.I.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Can]]></surname>
<given-names><![CDATA[Á. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Indicadores de calidad físico química de las aguas residuales del estado de Oaxaca, México]]></article-title>
<source><![CDATA[Terra Latinoamericana]]></source>
<year>2020</year>
<volume>38</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>361-75</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chadha]]></surname>
<given-names><![CDATA[D.K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A proposed new diagram for geochemical classification of natural waters and interpretation of chemical data]]></article-title>
<source><![CDATA[Hydrogeology Journal]]></source>
<year>1999</year>
<volume>7</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>431-9</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Clesceri]]></surname>
<given-names><![CDATA[L.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Greenberg]]></surname>
<given-names><![CDATA[A.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Eaton]]></surname>
<given-names><![CDATA[A.D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Standard Methods for the Examination of Water and Wastewater]]></source>
<year>1998</year>
<edition>20</edition>
<publisher-loc><![CDATA[Washington, D. C. ]]></publisher-loc>
<publisher-name><![CDATA[American Health Association (APHA)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<collab>Comisión Nacional del Agua</collab>
<source><![CDATA[Programa Hídrico Regional Visión 2030. Región Hidrológico-Administrativa V Pacífico Sur]]></source>
<year>2012</year>
<page-range>155</page-range><publisher-loc><![CDATA[México, D.F. ]]></publisher-loc>
<publisher-name><![CDATA[Secretaría de Medio Ambiente y Recursos Naturales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dong]]></surname>
<given-names><![CDATA[J.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[Y.Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Y.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[M.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Cai]]></surname>
<given-names><![CDATA[C.H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Chemometry use in the evaluation of the Sanya Bay water quality]]></article-title>
<source><![CDATA[Brazilian Journal of Oceanography]]></source>
<year>2010</year>
<volume>58</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>339-52</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Faitouri]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Salloum]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Muftah]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Determination of water type in Benghazi Plain aquifers by chemical and statistical methods]]></source>
<year>2018</year>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gajbhiye]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Sharma]]></surname>
<given-names><![CDATA[S.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Awasthi]]></surname>
<given-names><![CDATA[M.K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Application of principal components analysis for interpretation and grouping of water quality parameters]]></article-title>
<source><![CDATA[International Journal of Hybrid Information Technology]]></source>
<year>2015</year>
<volume>8</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>89-96</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Güler]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Thyne]]></surname>
<given-names><![CDATA[G.D.]]></given-names>
</name>
<name>
<surname><![CDATA[McCray]]></surname>
<given-names><![CDATA[E.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Turner]]></surname>
<given-names><![CDATA[A.K.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluation of graphical and multivariate statistical methods for classification of water chemistry data]]></article-title>
<source><![CDATA[Hydrogeology Journal]]></source>
<year>2002</year>
<volume>10</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>455-74</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[S.J.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[M.A.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Figueroa]]></surname>
<given-names><![CDATA[M.M.E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Análisis morfoestructural del estado de Oaxaca, México: un enfoque de clasificación tipológica del relieve]]></article-title>
<source><![CDATA[Investigaciones Geográficas]]></source>
<year>2008</year>
<volume>68</volume>
<page-range>7-24</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mancilla]]></surname>
<given-names><![CDATA[O.R.V.]]></given-names>
</name>
<name>
<surname><![CDATA[Bautista]]></surname>
<given-names><![CDATA[A.L.O.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[H.M.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[E.I.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Can]]></surname>
<given-names><![CDATA[A.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Guevara]]></surname>
<given-names><![CDATA[R.D.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[Y.M.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Hidrogeoquímica de salinas Zapotitlán y los lagos-cráter Alchichica y Atexcac, Puebla]]></article-title>
<source><![CDATA[IDESIA]]></source>
<year>2014</year>
<volume>32</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>55-69</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peña]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis de datos multivariantes]]></source>
<year>2002</year>
<page-range>539</page-range><publisher-loc><![CDATA[Madrid ]]></publisher-loc>
<publisher-name><![CDATA[McGraw-Hill Interamericana de España]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez]]></surname>
<given-names><![CDATA[D.J.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Ortega]]></surname>
<given-names><![CDATA[H.M.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[C.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Magdaleno]]></surname>
<given-names><![CDATA[H.F.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[E.I.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Can]]></surname>
<given-names><![CDATA[A.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Mancilla]]></surname>
<given-names><![CDATA[O.R.V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Concentración de nitrato, fosfato, boro y cloruro en el agua del río Lerma]]></article-title>
<source><![CDATA[Ecosistemas y Recursos Agropecuarios]]></source>
<year>2019</year>
<volume>6</volume>
<numero>16</numero>
<issue>16</issue>
<page-range>175-82</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[B.E.I.]]></given-names>
</name>
<name>
<surname><![CDATA[Sandoval]]></surname>
<given-names><![CDATA[O.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Camacho]]></surname>
<given-names><![CDATA[M.A.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Valdez]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[A.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Calidad hidrogeoquímica de las aguas del río Copalita, Oaxaca, México]]></article-title>
<source><![CDATA[Revista Internacional de Ciencia y Sociedad]]></source>
<year>2014</year>
<volume>1</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>27-41</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<collab>Secretaría del Medio Ambiente, Energías y Desarrollo Sustentable</collab>
<source><![CDATA[Programa Estatal de Cambio Climático de Oaxaca 2016-2022]]></source>
<year>2018</year>
<page-range>370</page-range><publisher-name><![CDATA[Gobierno Constitucional del Estado de Oaxaca]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shelton]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Engle]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Buccianti]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Blondes]]></surname>
<given-names><![CDATA[M.S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The isometric log-ratio (irl)-ion plot: A proposed alternative to the Piper diagram]]></article-title>
<source><![CDATA[Journal of Geochemical Exploration]]></source>
<year>2018</year>
<volume>190</volume>
<page-range>130-41</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Subba]]></surname>
<given-names><![CDATA[R.N.]]></given-names>
</name>
<name>
<surname><![CDATA[Sunitha]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Adimalla]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Chaudhary]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Quality criteria for groundwater use from a rural part of Wanaparthy District, Telangana State, India, through ionic spatial distribution (ISD), entropy water quality index (EWQI) and principal component analysis (PCA)]]></article-title>
<source><![CDATA[Environmental Geochemistry and Health]]></source>
<year>2020</year>
<volume>40</volume>
<page-range>1405-35</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tahvanainen]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Sallantaus]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Heikkilä]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Tolonen]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spatial variation of mire surface water chemistry and vegetation in Northeastern Finland]]></article-title>
<source><![CDATA[Annales Botanici Fennici]]></source>
<year>2002</year>
<volume>39</volume>
<page-range>235-51</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vásquez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Un índice de capacidad multivariante basado en la probabilidad de no conformidad, una aplicación al monitoreo de calidad de un ciclo de agua clarificada]]></article-title>
<source><![CDATA[Revista Ingeniería UC]]></source>
<year>2016</year>
<volume>23</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>319-26</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Velázquez]]></surname>
<given-names><![CDATA[A.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Ordaz]]></surname>
<given-names><![CDATA[A.A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Provincias hidrogeológicas de México]]></article-title>
<source><![CDATA[Tecnología y Ciencias del agua]]></source>
<year>1992</year>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[Z.Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Che]]></surname>
<given-names><![CDATA[Z.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[Y.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Dong]]></surname>
<given-names><![CDATA[J.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Wu]]></surname>
<given-names><![CDATA[M.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Identification of Surface water quality along the coast of Sanya, South China sea]]></article-title>
<source><![CDATA[PLos ONE]]></source>
<year>2015</year>
<volume>10</volume>
<numero>4</numero>
<issue>4</issue>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
