<?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>S0188-49992023000100200</article-id>
<article-id pub-id-type="doi">10.20937/rica.54740</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Measures to prevent cross-contamination in the analysis of microplastics: A short literature review]]></article-title>
<article-title xml:lang="es"><![CDATA[Medidas para prevenir la contaminación cruzada en el análisis de microplásticos: una breve revisión de la literatura]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Salas]]></surname>
<given-names><![CDATA[Arely Areanely]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Zeferino]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia-Fuentes]]></surname>
<given-names><![CDATA[Jocelyn]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Aragón]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Salvador]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Morillas]]></surname>
<given-names><![CDATA[Alethia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ojeda-Benítez]]></surname>
<given-names><![CDATA[Sara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Baja California Instituto de Ingeniería ]]></institution>
<addr-line><![CDATA[Mexicali Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[Azcapotzalco Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>39</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992023000100200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992023000100200&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992023000100200&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Marine environments are the most studied habitats when addressing microplastic pollution. However, there are no standardized methodologies for this analysis, so methodologies are often adapted by researchers. This situation has raised doubts concerning the reliability and reproducibility of results that are related to the null or little use of measures to avoid cross-contamination. The objective of this work was to carry out a short review and analyze the different measures that have been reported in research articles for different marine habitats, published in the ScienceDirect database in 2020, to avoid cross-contamination during fieldwork and laboratory work. From the 115 analyzed articles, eight did not report measures at any stage, 61 took measures during sampling, and 98 did it in the processing stage. Even though most studies take steps to prevent cross-contamination, they do not specify the percentage of contamination avoided. However, from the concentrations of microplastics in the blanks and the total microplastic concentrations in the samples, we estimate that between 4.8 and 69 % of contamination is avoided in sampling and between 0.1 and 48.8 % in the laboratory. This shows the need to establish standards for sampling and sample processing, which must include measures regarding the marine environment studied and the stage addressed, as well as the minimum percentages that should be met for the data to be considered valid and reliable.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los ambientes marinos destacan entre los hábitats estudiados para la contaminación por microplásticos. Sin embargo, no existen metodologías estandarizadas para su análisis por lo que a menudo se adaptan métodos propuestos por los investigadores. Esto ha generado dudas sobre la confiabilidad y reproducibilidad de los resultados, relacionadas con la nula o limitada utilización de medidas para evitar contaminación cruzada. El objetivo de este trabajo fue realizar una revisión corta y analizar las diferentes medidas que se han reportado en artículos de investigación de diferentes hábitats marinos, publicados en ScienceDirect en 2020, para evitar la contaminación cruzada durante los trabajos de campo y laboratorio. De un total de 115 trabajos, ocho no reportaron medidas, 61 tomaron medidas en los muestreos y 98 lo hicieron en el procesamiento de las muestras. Aun cuando la mayoría de los estudios adoptan medidas para evitar la contaminación cruzada, éstos no especifican el porcentaje de contaminación evitada. Sin embargo, a partir de las concentraciones de microplásticos en los blancos y las concentraciones totales de microplásticos en las muestras, estimamos que para el muestro se evita entre 4.8 y 69 % de contaminación y en el laboratorio de 0.1 a 48.8 %. Lo anterior muestra que es necesario establecer estándares para el muestreo y procesamiento de muestras, los cuales deben incluir las medidas que deben tomarse por ambiente estudiado y etapa abordada, así como los porcentajes mínimos que deben cumplirse para que los datos se consideren válidos y confiables.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[quality assurance]]></kwd>
<kwd lng="en"><![CDATA[blanks]]></kwd>
<kwd lng="en"><![CDATA[reliability]]></kwd>
<kwd lng="en"><![CDATA[background contamination]]></kwd>
<kwd lng="en"><![CDATA[airborne fibers]]></kwd>
<kwd lng="es"><![CDATA[control de calidad]]></kwd>
<kwd lng="es"><![CDATA[blancos]]></kwd>
<kwd lng="es"><![CDATA[confiabilidad]]></kwd>
<kwd lng="es"><![CDATA[contaminación de fondo]]></kwd>
<kwd lng="es"><![CDATA[fibras en el aire]]></kwd>
</kwd-group>
</article-meta>
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