Lead-selective electrode based on the misfit compound (PbS)1.18TiS2

A lead-selective solid-contact electrode was prepared on the basis of the misfit compound (PbS)(1.18)TiS2 The electrode exhibits the slope of the electrode function is -(26 +/- 1) mV/pc and provides the determination of 1 x 10(-5)-5 x 10(-2) M lead in the pH range 2.75-5.0. High selectivity of the electrode for Ni2+ Co2+, Zn2+, Cu2+, Ag+, K+, Ba2+, and Sr2+ ions was demonstrated. The addition of graphite to the active phase of the membrane impaired the selectivity of the electrode. The electrode was used for the potentiometric indication of the titration end point in the determination of lead in copper alloys.