A highly sensitive PVC membrane iodide electrode based on complexes of mercury(II) as neutral carrier

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• 作者：Y. -Q. Chai ; R. Yuan ; L. Xu ; W. -J. Xu ; J. -Y. Dai and F. Jiang
• 关键词：1 ; 4 ; Bis(5 ; methyl ; 1 ; 3 ; 4 ; thiadiazole ; 2 ; yl ; thio)butanemercury(II) ; Neutral carrier ; Iodide ; Ion ; selective electrode
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2004
• 出版时间：September 2004
• 年：2004
• 卷：380
• 期：2
• 页码：333-338
• 全文大小：301 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

A novel solvent polymeric membrane electrode based on bis(1,3,4-thiadiazole) complexes of Hg(II) is described which has excellent selectivity and sensitivity toward iodide ion. The electrode, containing 1,4-bis(5-methyl-1,3,4-thiadiazole-2-yl-thio)butanemercury(II) [Hg(II)BMTB(NO₃)₄], has a Nernstian potentiometric response from 2.0×10–8 to 2.0×10–2 mol L–1 with a detection limit of 8.0×10–9 mol L–1 and a slope of –59.0±0.5 mV/decade in 0.01 mol L–1 phosphate buffer solution (pH 3.0, 20°C). The selectivity sequence observed is iodide>bromide>thiocyanate>nitrite>nitrate>chloride>perchlorate>acetate>sulfate. The selectivity behavior is discussed in terms of the UV–Vis spectrum, and the process of transfer of iodide across the membrane interface is investigated by use of the AC impedance technique. The electrode was successfully applied to the determination of iodide in Jialing River and Spring in Jinyun Mountains, with satisfactory results.