Formation constants for Pb(II)-iminodiacetic acid complexes as determined by potentiometry with glass,Pb-Amalgam and lead ion-selective electrodes |
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| Affiliation: | 1. Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China;2. CSIRO Land and Water, Centre for Environment and Life Sciences, Private Bag 5, Wembley, 6913, WA, Australia;3. Sichuan Jinsha Nano Technology Co., Ltd., Panzhihua Vanadium and Titanium Industrial Park, Panzhihua, Sichuan Province 730900, China;4. Zhangjiakou, Hebei Energy and Environmental Engineering, Hebei Institute of Architectural Engineering, Hebei 075000, China |
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| Abstract: | The complex formation between Pb(II) and iminodiacetic acid was studied at 25°C in 1 mol dm−3 KNO3 medium. The e.m.f. measurements were carried out by means of glass, Pb-amalgam and lead ion-selective electrodes. Three species PbHL+, PbL and PbLstaggered22− were found in the −log[H+] region 2–9. The protonation constants of iminodiacetic acid and the formation constants of the complexes are tabulated in Tables 1 and 2, respectively. By comparison of the results from the amalgam electrode and ion-selective electrode systems, it was found that the ion-selective electrode shows a satisfactory performance in the solutions examined. |
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