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PubMed · 12940601

Sulfate-selective PVC membrane electrode based on a strontium Schiff's base complex.

Mohammad Reza Ganjali·Parviz Norouzi·Mahmood Gol-Mohammadi·Farhang Mizani·Tahereh Poursaberi·Masoud Salavati-Niasari·Mojtaba Shamsipur·Morteza Hosseini·Mehran Javanbakht
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Abstract

A strontium Schiff's base complex (SS) can be used as a suitable ionophore to prepare a sulfate-selective PVC-based membrane electrode. The use of oleic acid (OA) and hexadecyltrimethylammonium bromide (HTAB), as additives, and nitrobenzen (NB), dibutyl phthalate (DBP) and benzyl acetate (BA) as solvent mediators, were investigated. The best performance was observed with a membrane composition PVC: NB: SS: HTAB of 30%: 62%: 5%: 3% ratio. The resulting sensor works well over a wide concentration range (1.0 x 10(-2)-1.0 x 10(-6) M) with a Nernstian slope of -29.2 mV per decade of sulfate activity over a pH range 4.0-7.0. The limit of detection of the electrode is 5 x 10(-7) M. The proposed sensor shows excellent discriminating ability toward SO4(2-) ions with regard to many anions. It has a fast response time of about 15 s. The membrane electrode was used to the determination of zinc in zinc sulfate tablets. The sensor was also used as an indicator electrode in the potentiometric titration of SO4(2-) against barium ion.

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Ion-Selective ElectrodesIonophoresPolyvinyl ChloridePotentiometrySchiff BasesStrontiumSulfatesZincZinc SulfateJournal ArticleResearch Support, Non-U.S. Gov't

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Mohammad Reza Ganjali, Parviz Norouzi, Mahmood Gol-Mohammadi, Farhang Mizani, Tahereh Poursaberi, Masoud Salavati-Niasari, Mojtaba Shamsipur, Morteza Hosseini, Mehran Javanbakht. Sulfate-selective PVC membrane electrode based on a strontium Schiff's base complex.. https://pubmed.ncbi.nlm.nih.gov/12940601/

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