DDB liver drug as a novel ionophore for potentiometric barium (II) membrane sensor
Dimethyl-4,4-dimethoxy-5,6,5′,6′-dimethylene dioxy biphenyl-2,2-dicarboxylate (DDB) liver drug is used as a novel ionophore in plasticized poly (vinyl chloride) (PVC) matrix membrane sensors for barium ions. Optimum performance characteristics are displayed by membrane sensor incorporating DDB ionop...
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Veröffentlicht in: | Talanta (Oxford) 2003-01, Vol.59 (1), p.161-166 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Dimethyl-4,4-dimethoxy-5,6,5′,6′-dimethylene dioxy biphenyl-2,2-dicarboxylate (DDB) liver drug is used as a novel ionophore in plasticized poly (vinyl chloride) (PVC) matrix membrane sensors for barium ions. Optimum performance characteristics are displayed by membrane sensor incorporating DDB ionophore, potassium tetrakis(4-chlorophenyl)borate as lipophilic salt, and
o-nitrophenyloctyl ether as plasticizer. The sensor exhibits a linear response over the concentration range 10
−1–10
−5 mol l
−1 BaCl
2 with a Nernstian slope of 30 mV per decade and high selectivity towards Ba
2+ with respect to Li
+, Na
+, K
+, Rb
+, NH
4
+, Mg
2+, Ca
2+, Sr
2+, Mn
2+, Co
2+, Ni
2+, Cd
2+, Al
3+, La
3+, and Ce
3+ ions. The sensor response is stable over a wide pH range (4–9) and the lifetime is about 2 months. The proposed sensor is successfully applied to the determination of Ba
2+contents of some rocks. |
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ISSN: | 0039-9140 1873-3573 |
DOI: | 10.1016/S0039-9140(02)00464-2 |