COATED WIRE LEAD ION SELECTIVE ELECTRODE BASED ON DITHIZONE

Document Type : Original Article

Authors

1 Chemistry department, Faculty of Science Al-Azhar University, Cairo, Egypt

2 Hot Labs Center, Atomic Energy Authority, Cairo, Egypt

3 Chemistry Department, Faculty of Science Al-Azhar University, Cairo, Egypt

Abstract

PVC based membrane of 1,5-diphenylthiocarbazone (dithizone) reveals a Nernstain potentiometric response with the slope of 29 + 2 mV per decade for Pb2+ over a concentration range (5.0×10-6-1.0×10-2 M). The used electrode was suitable in aqueous solutions in a pH range of 8 to 10. The response time of the electrode is about 15 s and was used for a period of 45 days. The proposed electrode was used in two different applications such as the determination of lead concentration in a part of lead water pipe and as an indicator electrode for potentiometric titration of Pb2+ions.

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