<?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>1665-6423</journal-id>
<journal-title><![CDATA[Journal of applied research and technology]]></journal-title>
<abbrev-journal-title><![CDATA[J. appl. res. technol]]></abbrev-journal-title>
<issn>1665-6423</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-64232022000600631</article-id>
<article-id pub-id-type="doi">10.22201/icat.24486736e.2022.20.6.955</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Design and synthesis of the polyvinyl chloride (PVC) membrane for Fe(III) ion selective electrode (ISE) based on ester modified humic acid (EHA) as an ionophore]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hermanto]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Siswanta]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mudasir]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muhali]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ismillayli]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Mataram Faculty of Mathematics and Natural Sciences Department of Chemistry]]></institution>
<addr-line><![CDATA[Mataram West Nusa Tenggara]]></addr-line>
<country>Indonesia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Gadjah Mada Faculty of Mathematics and Natural Sciences Department of Chemistry]]></institution>
<addr-line><![CDATA[Sleman Yogyakarta]]></addr-line>
<country>Indonesia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Mandalika University of Education Faculty of Science and Mathematics Education Department of Chemistry Education]]></institution>
<addr-line><![CDATA[Mataram West Nusa Tenggara]]></addr-line>
<country>Indonesia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>20</volume>
<numero>6</numero>
<fpage>631</fpage>
<lpage>637</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-64232022000600631&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-64232022000600631&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-64232022000600631&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Design and synthesis of the polyvinyl chloride (PVC) membrane as Fe(III) ion selective electrode (ISE) sensor based on ester modified humic acid (EHA) ionophore as an excellent sensory molecule for monitoring Fe(III) in the sample solution had been done. Simple and efficient EHA was made by condensation of carboxylic acid HA with ethanol and sulfuric acid as catalysts. PVC membrane was prepared by mixing all components such as PVC powder, EHA, plasticizer (o-NPOE and DOP), and anion lipophilic (Sodium-TPB and oleic acid) with a total weight of 100 mg and dissolved in 1 mL of dry THF. The electrode membrane responses showed that the electrodes were highly selective to ion Fe3+ at pH 3 with a response time of ±50 seconds. The dynamic range of the membrane ISE sensor was 10-1-10-7 M, with the value of the Nernst factor being ±19 mV per decade. The membrane electrode can be used for at least 5 weeks. The analytical results of Fe(III) measurement showed good conformity with the reference method (AAS), suggesting that the developed analytical tool could be used to measure and monitor Fe(III) in real water samples.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[PVC membrane]]></kwd>
<kwd lng="en"><![CDATA[Fe(III)]]></kwd>
<kwd lng="en"><![CDATA[ion selective electrode]]></kwd>
<kwd lng="en"><![CDATA[ester modified humic acid]]></kwd>
</kwd-group>
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