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<rdf:Description rdf:about="https://riquim.fq.edu.uy/items/show/6152">
    <dcterms:title><![CDATA[<strong>Towards the abatement of nitrate interference on selenium determination by photochemical vapor generation</strong>]]></dcterms:title>
    <dcterms:subject><![CDATA[VAPOR FOTOQUIMICO
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    <dcterms:subject><![CDATA[NITRATOS
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    <dcterms:subject><![CDATA[SELENIO-DETERMINACION
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    <dcterms:subject><![CDATA[ANALISIS DE TRAZAS
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    <dcterms:subject><![CDATA[BIBLIOGRAFIA NACIONAL QUIMICA
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    <dcterms:subject><![CDATA[2020
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    <dcterms:abstract><![CDATA[A flow injection photochemical vapor generation atomic absorption spectrometry (FI-PVG-AAS) system was developed for selenium determination. The variables of influence of the photochemical generation process were evaluated and optimized. Sample already reduced to the Se(IV) state and mixed with the photochemical reagent (1.5% w/w HCOOH) was irradiated for 3 s. Selenium derivatives were transferred to an externally heated atomization cell by an argon-hydrogen mixture and selenium determined at 196.0 nm. Nitrogen was used as the carrier of the flow injection system. Nitrate is one of the most relevant interferents for the photochemical generation process; it is a very frequent concomitant as nitric acid is added for sample digestion or preservation. Hence, its removal before the vapor generation stage was studied. It was found that up to 3.0% w/w HNO3, it can be eliminated in the reduction stage of Se(VI) to Se(IV) with hydrochloric acid. For higher concentrations (up to 21% w/w HNO3), prior to the reduction step, the addition of 40% w/w H2CO and evaporation almost to dryness was successful for the abatement of the interference. The performance of the method was studied and its applicability evaluated with a Trace Element in Water Certified Reference Material (24.3 &mu;g L&minus;1 &ndash; Se, 2.8% w/w HNO3) and a spiked rice-flour microwave-assisted digest (103.1 &mu;g L&minus;1 &ndash; Se, 18.5% w/w HNO3).
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    <dcterms:creator><![CDATA[<strong>Mollo, Alicia</strong>]]></dcterms:creator>
    <dcterms:creator><![CDATA[<strong>Knochen, Mois&eacute;s</strong>
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    <dcterms:source><![CDATA[Spectrochimica Acta Part B v. 169, 2020.-- p. 1-10.-- e105875
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    <dcterms:publisher><![CDATA[Elsevier
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    <dcterms:date><![CDATA[2020
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    <dcterms:rights><![CDATA[<p><strong>Informaci&oacute;n sobre Derechos de Autor</strong> (Por favor lea este aviso antes de abrir los documentos u objetos)<strong> La legislaci&oacute;n uruguaya protege el derecho de autor </strong>sobre toda creaci&oacute;n literaria, cient&iacute;fica o art&iacute;stica, tanto en lo que tiene que ver con sus derechos morales, como en lo referente a los derechos patrimoniales con sujeci&oacute;n a lo establecido por el derecho com&uacute;n y las siguientes leyes (LEY 9.739 DE 17 DE DICIEMBRE DE 1937 SOBRE PROPIEDAD LITERARIA Y ARTISTICA CON LAS MODIFICACIONES INTRODUCIDAS POR LA LEY DE DERECHO DE AUTOR Y DERECHOS CONEXOS No. 17.616 DE 10 DE ENERO DE 2003, LEY 17.805 DE 26 DE AGOSTO DE 2004, LEY 18.046 DE 24 DE OCTUBRE DE 2006 LEY 18.046 DE 24 DE OCTUBRE DE 2006) ADVERTENCIA - La consulta de este documento queda condicionada a la aceptaci&oacute;n de las siguientes condiciones de uso: Este documento es &uacute;nicamente para usos privados enmarcados en actividades de investigaci&oacute;n y docencia. No se autoriza su reproducci&oacute;n con fines de lucro. Esta reserva de derechos afecta tanto los datos del documento como a sus contenidos. En la utilizaci&oacute;n o cita de partes debe indicarse el nombre de la persona autora.</p>
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    <dcterms:format><![CDATA[Pdf
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    <dcterms:language><![CDATA[Ingl&eacute;s
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    <dcterms:type><![CDATA[Art&iacute;culo
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    <dcterms:identifier><![CDATA[https://doi.org/10.1016/j.sab.2020.105875
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