Solid-contact polyvinyl chloride membrane electrode based on the bis[(2-(hydroxyethylimino)phenolato]copper(ii) complex for trace level determination of copper ions in wastewater

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From: Canadian Journal of Chemistry(Vol. 92, Issue 4)
Publisher: NRC Research Press
Document Type: Report
Length: 3,795 words
Lexile Measure: 1540L

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Abstract: A miniaturized solid-contact polyvinyl chloride membrane electrode based on the bis[(2-(hydroxyethylimino)phenolato]copper(II) complex has been prepared for the determination of Cu(II) ion in real samples. The influence of coating membrane composition, pH, and possible interfering cations on the response of the ion-selective electrode was investigated. A number of membranes at different compositions were prepared and their [Cu.sup.2+] sensing capabilities were investigated. The best results for [Cu.sup.2+] sensing was obtained for the electrode membrane containing ionophore - 2-nitrophenyloctyl ether - polyvinyl chloride and potassium tetrakis(p-chlorophenyl)borate in a ratio of 4:65:30:1 (w/w, mg), respectively. The prepared electrode exhibited a near-Nernstian response (28.3 mV/decade) to [Cu.sup.2+] in the concentration range from 1.0 x [10.sup.-6] to 1.0 x [10.sup.-1] mol/L with a limit of detection of 8.3 x [10.sup.-7] mol/L. The potentiometric response of the electrode was independent from the pH of the test solution in the pH range of 3.0-6.0. The electrode has a very short response time, about 15 s, and it can be used over a period of 3 months without any divergence in potential. The electrode has been successfully applied as an indicator electrode in potentiometric titration of Cu(II) ions with ethylenediaminetetraacetic acid and in the determination of Cu(II) in wastewater of the copper processing industry. Key words: potentiometry, copper selective electrodes, wastewater analysis. Une electrode miniaturisee a contact solide recouverte d'une membrane de chlorure de polyvinyle, a base du complexe bis-[(2-(hydroxyethylimino)phenolato]cuivre(II) a ete preparee afin de determiner la concentration de Cu(II) dans desun echantillons reels. L'influence de la composition de la membrane enveloppante, du pH et d'eventuels cations interferents sur l'electrode selective d'ion a ete etudiee. Plusieurs de compositions differentes ont ete preparees et leur capacite a detecter le [Cu.sup.2+] exploree. Les meilleurs resultats de detection du [Cu.sup.2+] ont ete obtenus avec la membrane d'electrode composee d'un solute ionophore, de 2-nitrophenyl octyl ether, de chlorure de polyvinyle et de tetrakis(p-chlorophenyl)borate de potassium dans des proportions respectives de 4:65:30:1 (fraction massique avec masses exprimees en mg). L'electrode preparee a donne une reponse quasi Nernstienne (28,3 mV/decade) en presence de [Cu.sup.2+] dans des concentrations comprises entre 1 x [10.sup.-6] et 1 x [10.sup.-1] mol/L, la limite de detection se situant a 8,3 x [10.sup.-7] mol/L. La reponse potentiometrique de l'electrode etait independante du pH de la solution d'essai lorsque le pH etait compris entre 3,0 et 6,0. L'electrode a un temps de reponse tres court, d'environ 15 s et peut etre utilisee pendant 3 mois sans presenter la moindre divergence de potentiel. L'electrode a ete utilisee avec succes comme electrode indicatrice pour le titrage potentiometrique d'ions Cu(II) en presence d'acide ethylene diamine tetraacetique et pour le dosage du Cu(II) dans les eaux usees produites par l'industrie de transformation du cuivre. [Traduit par la Redaction] Mots-cles: potentiometrie, electrodes selective au cuivre, analyse des eaux usees.

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Gale Document Number: GALE|A370212631