Abstract
A Pt wire coated with a bentonite-carbon composite in a poly(vinyl chloride) membrane was used for detection of lead. The sensor has a Nernstian slope of 29.42+/-0.50 mV per decade over a wide range of concentration, 1.0 x 10(-7) to 1.0 x 10(-3) mol L(-1) Pb(NO(3))(2). The detection limit is 5.0 x 10(-8) mol L(-1) Pb(NO(3))(2) and the electrode is applicable in the pH range 3.0-6.7. It has a response time of approximately 10 s and can be used at least for three months. The electrode has good selectivity relative to nineteen other metal ions. The practical analytical utility of the electrode is demonstrated by measurement of Pb(II) in industrial waste and river water samples.
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