Sorption of small amounts of silver(I) on lead sulfide has been measured in dependence on pH, time of sorption, and concentrations of sorbate and sorbent. Also, the influence of complexing agents on the sorption process has been studied. Lead sulfide can be used for the preconcentration of silver (I) in a broad range of pH values. The sorption capacity for silver(I) is high, since the process is not restricted only to the surface of the PbS sorbent. Although the presence of complexing agents (e.g. EDTA, citrate) affects the kinetics of the sorption of silver(I), quantitative preconcentration of silver(I) after a given sorption time is possible. However, in the presence of thiosulfate in high concentrations, quantitative preconcentration of silver(I) by the PbS sorbent cannot be performed.