<?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>0872-1904</journal-id>
<journal-title><![CDATA[Portugaliae Electrochimica Acta]]></journal-title>
<abbrev-journal-title><![CDATA[Port. Electrochim. Acta]]></abbrev-journal-title>
<issn>0872-1904</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Electroquímica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0872-19042021000500381</article-id>
<article-id pub-id-type="doi">10.4152/pea.2021390505</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Potentiometric Determination of Oxymetazoline Hydrochloride Using Modified Carbon Paste Electrodes]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Issa]]></surname>
<given-names><![CDATA[Yousry M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Khalil]]></surname>
<given-names><![CDATA[Mohamed M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zayed]]></surname>
<given-names><![CDATA[Sayed I. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mustafa]]></surname>
<given-names><![CDATA[Naglaa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Cairo University Faculty of Science Chemistry Department]]></institution>
<addr-line><![CDATA[Giza ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Beni-Suef University Faculty of Science Chemistry Department]]></institution>
<addr-line><![CDATA[Beni-Suef ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Beni-Suef University Faculty of Technology and Education ]]></institution>
<addr-line><![CDATA[Beni-Suef ]]></addr-line>
<country>Egypt</country>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>10</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>10</month>
<year>2021</year>
</pub-date>
<volume>39</volume>
<numero>5</numero>
<fpage>381</fpage>
<lpage>392</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0872-19042021000500381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0872-19042021000500381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0872-19042021000500381&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Two carbon paste electrodes for oxymetazoline hydrochloride were constructed based on ion pair complexes of this drug, with sodium tetraphenylborate (NaTPB) or ammonium reineckate, using dibutyl phthalate and dioctyl phthalate as solvent mediators, respectively. The developed electrodes displayed a fast, stable response over the concentration range from 3.98x10-5 to 1x10-2 M oxymetazoline hydrochloride, with a near-nernstian slope of 59.0, 58.2 mV of concentration decade-1 and a limit of detection (LOD) of 3.31x10-5 and 3.72x10-5 M, in the oxymetazoline-tetraphenylborate and oxymetazoline-reineckate cases, respectively. The developed electrodes have been successfully applied for oxymetazoline hydrochloride determination in the Afrin nasal drop pharmaceutical formulation.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Oxymetazoline hydrochloride]]></kwd>
<kwd lng="en"><![CDATA[modified carbon paste electrode]]></kwd>
<kwd lng="en"><![CDATA[potentiometry]]></kwd>
<kwd lng="en"><![CDATA[pharmaceutical formulation]]></kwd>
</kwd-group>
</article-meta>
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