A. simple and inexpensive Pbs-FET with high sensitivity and short response time was developed which consists of a PbS layer on a pH-sensitive gate of a field effect transistor. The PbS-layer was prepared with simple wet precipitations technique. The PbS-FET has about the same selectivities for Pb2+-and for Cu''-ions, but only slight sensitivity for Cd2+-and Zn2+-ions. The sensor was integrated in a FIA system. By variing the injection time the measuring range varied between l o -' -l o p 6 and lo-'-l o p 8 mol Pb2+/1. The PbS-FET-FIA system is suitable for monitoring of Pb2+ concentrations in drinking water.
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