Direkte potentiometrische Sulfatbestimmung

Abstract

The direct sulphate determination described uses the distinct pH alteration occuring at the endpoint when sulphate ions are titrated in an alcoholicaqueous or acetonic-aqueous solution (pH 7-7.5) with aqueous Ba(NO3)2/Pb(NO3)2 solutions. A suitable combination of electrodes-such as glass/calomel-indicates the endpoint as a pH-break of 1-3 units. The simple and rapid method can replace the more laborous gravimetric method in certain cases. A standard deviation of 0.7% has been obtained for 8 mg of S. © 1968 Springer-Verlag.