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Acta Chimica Sinica ›› 1996, Vol. 54 ›› Issue (5): 516-520. Previous Articles
Original Articles
袁若;林守群;沈国励;田德余;俞汝勤
发布日期:
YUAN RUO;LIN SHOUQUN;SHEN GUOLI;TIAN DEYU;YU RUQIN
Published:
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The present paper describes solvent polymeric membrane anion selective electrodes based on di(ethylxanthate) complexes of metal(Ⅱ) [cobalt(Ⅱ), mercury(Ⅱ) and zinc(Ⅱ)] as neutral carriers. The electrode incorporating cobalt(Ⅱ)-di(ethylxanthate) has high selectivity toward the iodide ion and demonstrates anti-Hofmeister behaviour. The electrode showed a near-Nernstian potentiometric response for 10^-^1~10^-^6mol/L I^- with a detection limit of 7.9×10^-^7mol/L and a slope of 54mV/pI^- (20℃). The electrode has low resistance, fast response time, fair stability and reproducibility. The selectivity sequence observed is iodide> thiocyanate>nitrite>bromide>perchlorate>sulfate>nitrate>chloride. The response mechanism of the electrode was also studied with the a.c. impedance and spectroscopic techniques.
Key words: ION SELECTIVE ELECTRODE, XANTHOGENIC ACIDS, COBALT COMPLEX
CLC Number:
O646
YUAN RUO;LIN SHOUQUN;SHEN GUOLI;TIAN DEYU;YU RUQIN. Di(ethylxanthate) complexes of metal(Ⅱ) as neutral carriers for highly selective iodide electrodes[J]. Acta Chimica Sinica, 1996, 54(5): 516-520.
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