Titration of sulphate in mineral waters and sea water by using the solid-state lead electrode

Abstract

A procedure is described for the determination of sulphate in the range 20 to 3000 p.p.m. in mineral and sea waters by using a lead-selective electrode.

Chloride and hydrogen carbonate are separated from the sample by passing it firstly through a cation-exchange resin in the silver form, and secondly through a cation-exchange resin in the acid form. The solution recovered is titrated with standard lead nitrate solution.