<?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>2224-6185</journal-id>
<journal-title><![CDATA[Tecnología Química]]></journal-title>
<abbrev-journal-title><![CDATA[RTQ]]></abbrev-journal-title>
<issn>2224-6185</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Oriente]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2224-61852024000100107</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estimación de incertidumbre para determinaciones de cobalto y hierro en muestras pareadas de NiS y NiO por regresión lineal]]></article-title>
<article-title xml:lang="en"><![CDATA[Uncertainty estimation for Cobalt and Iron determinations in paired samples of NiS and NiO by linear regression]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Vargas]]></surname>
<given-names><![CDATA[Armando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ricardo-Riverón]]></surname>
<given-names><![CDATA[Aymara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ojeda-Armaignac]]></surname>
<given-names><![CDATA[Elaine]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serrat-Guasch]]></surname>
<given-names><![CDATA[Nurian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Empresa de Servicios Técnicos de Computación, Comunicaciones y Electrónica del Níquel (SERCONI)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigaciones del Níquel (CEDINIQ)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Oriente Facultad de Ingeniería Química y Agronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2024</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>107</fpage>
<lpage>121</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2224-61852024000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2224-61852024000100107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2224-61852024000100107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La comparación interlaboratorio provee evidencia experimental del desempeño continuo del laboratorio para realizar pruebas específicas. En este trabajo, se determinó la incertidumbre de las mediciones y el error para los análisis químicos de cobalto y hierro en muestras pareadas de sulfuro de níquel (NiS) y óxido de níquel sinterizado (NiO), mediante mínimo-cuadrados de regresión lineal. Las determinaciones analíticas se realizaron por Espectrometría de Absorción Atómica con la participación de dos laboratorios del grupo empresarial para la producción de níquel en Cuba. Los supuestos del modelo de regresión lineal se comprobaron mediante el estadístico de Durbin-Watson, pruebas de homocedasticidad y normalidad. Se determinó la incertidumbre de la pendiente (Sm), la incertidumbre del intercepto (Sb) y la desviación estándar de la medición (Sy). Como resultado, la incertidumbre (Sx0) asociada con el valor esperado (x0) y el error (&#958;) en la determinación de cobalto fue Sx0 = 0,3 % y &#958; = ( 0,60 % en el Sulfuro de Níquel (NiS), y Sx0 = 0,03 % y &#958; = ( 0,05 % en el Óxido de Níquel (NiO). En cuanto a la determinación de hierro, se obtuvo Sx0 = 0,16 % y &#958; = ( 0,32 % en el NiS, y Sx0 = 0,05 % y &#958; = ( 0,09 % en el NiO. Este método utiliza la base de datos histórica de comparación interlaboratorio y aporta información para las decisiones de gestión estratégica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Interlaboratory comparison provides experimental evidence on the lab continuous performance to realize specific tests. In this work, uncertainty of measurements and the interlaboratory error for the chemical analysis of cobalt and iron was determined in paired samples of nickel sulfide (NiS) and sintered nickel oxide (NiO), using the least-squares linear regression. The analytical determinations were made by Atomic Absorption Spectrometry (AAS) with the participation of two laboratories of the corporative group for the production of nickel in Cuba. The assumptions of the linear regression model were verified using the Durbin-Watson statistic, homoscedasticity and normality test. The uncertainty in the slope (Sm), in the intercept (Sb) and the standard deviation of the measurement (Sy) were determined. As a result, the uncertainty (Sx0) associated with the expected value (x0) and error (&#958;) in cobalt determination was Sx0 = 0,3 % and &#958; = ( 0,60 % in Nickel Sulfide (NiS), and Sx0 = 0,03 % and &#958; = ( 0,05 % in Nickel Oxide (NiO). As for iron determination, it was obtained Sx0 = 0,16 % and &#958; = ( 0,32 % in NiS, and Sx0 = 0,05 % and &#958; = ( 0,09 % in NiO. This method uses the historic database of interlaboratory comparison and provides information to strategic management decisions.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[interlaboratory comparison]]></kwd>
<kwd lng="en"><![CDATA[lineal regression]]></kwd>
<kwd lng="en"><![CDATA[uncertainty]]></kwd>
<kwd lng="es"><![CDATA[comparación interlaboratorio]]></kwd>
<kwd lng="es"><![CDATA[regresión lineal]]></kwd>
<kwd lng="es"><![CDATA[incertidumbre]]></kwd>
</kwd-group>
</article-meta>
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