A Novel Ion‐Selective Electrode for Determination of the Mercury(II) Ion Based on Schiff Base as a Carrier |
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| Authors: | M Zhang X Wu Y Q Chai R Yuan G R Ye |
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| Institution: | 1. Chongqing Key Laboratory of Analytical Chemistry, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China;2. College of Chemistry, Changchun Normal University, Changchun City, Jilin Province, P. R. China;3. Chongqing Fire Department, Chongqing 401121, P. R. China |
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| Abstract: | A new poly(vinyl chloride) (PVC) membrane ion‐selective electrode based on bis‐salicyladehyde‐diaminjodipropylamine (BSDDA) as an ion carrier was successfully applied to the detection of Hg2+ ions. This electrode displayed good selectivity toward Hg2+ in comparison with other metal ions and exhibited a Nernstian slope of 30.5 ± 0.4 mV per decade of Hg2+ over a concentration range of 9.5 × 10?7 to 6.4 × 10?2 M of Hg2+ in the pH range 1.5 to 3.5. The detection limit was 7.0 ± 0.2 × 10?7 M and response time was about 10 s to 25 s. The electrode can be used at least 2 months without apparent divergence in potential. In addition, the effects of experimental parameters such as membrane composition, nature and amounts of plasticizer and additive were investigated. The proposed electrode could be used as an indicator electrode in the detection of Hg2+ in samples. |
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| Keywords: | Mercury(II) ion‐selective electrode PVC membrane Schiff base Bis‐salicyladehyde‐diaminjodipropylamine Potentiometry |
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