Abstract: Anew lead ion-selective electrode of PVCmembrane based on the neutral carrier of Pb·lgepal co-880·2TPBgives a fast stable and reproducible linear response within a lerd nitrate concentration range of 7×10^-6M-1×0^-1M.The coefficient of selectivity of a number of cations varries from 10^-3 to 10^-5 The life time of the membrane is over 7 months.The electrode can be used as a incicator electrode for the potcntiomeiric titralion of Cr(Ⅵ) in electrical plating solution.