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Iodide‐Selective Electrodes Based on Bis[ N (2‐methyl‐phenyl) 4‐Nitro‐thiobenzamidato]mercury(II) and Bis[ N ‐phenyl 3,5‐Dinitro‐thiobenzamidato]mercury(II) Carriers
Author(s) -
Ghaedi Mehrorang,
Shojaie Abdolah Falah,
Montazerozohori Morteza,
Karami Bahador,
Gharaghani Shiva
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503278
Subject(s) - iodide , chemistry , mercury (programming language) , electrode , inorganic chemistry , detection limit , vinyl chloride , titration , membrane , chloride , methyl iodide , nuclear chemistry , organic chemistry , chromatography , polymer , biochemistry , computer science , copolymer , programming language
Highly selective poly(vinyl chloride) (PVC) membrane electrodes based on recently synthesized mercury complexes including Hg(Nmpntb) 2 and Hg(Npdntb) 2 as new carriers for iodide‐selective electrodes by incorporating the membrane ingredients on the surface of graphite electrodes are reported. The effect of various parameters including the membrane composition, pH and possible interfering anions were investigated on the response properties of the electrodes. Both sensors exhibited Nernstian responses toward iodide over a wide concentration range of 7×10 −7 to 0.1 M and 1×10 −6 to 0.1 M, with slopes of 59.6±0.8 and 58.9±0.9 mV per decade of iodide concentration and detection limit of 3×10 −7 M and 7×10 −7 for Hg(Npdntb) 2 and Hg(Nmpntb) 2 , respectively, over a wide pH range of 3–11. The sensors have response times of ≤5 s and can be used for at least 2 months without any considerable divergence in their potential response. The proposed electrodes show good ability to discriminate iodide over several inorganic and organic anions. The electrodes were successfully applied to direct determination of iodide in synthetic mixture, waste water and drinking water and as indicator electrodes in precipitation titrations.