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Potentiometric Titration of Sulfate in Water and Soil Extracts Using a Lead Electrode¹

ABSTRACT

Sulfate concentrations in natural waters and soil-water extracts were determined semiautomatically using a lead-ion electrode to indicate the solution potential change at the endpoint, a constant flow device to deliver the titrant, a pH-mV meter to measure the potential, and a strip chart recorder to plot the solution potential thus indicating the endpoint. Sulfate concentrations as low as 0.5 meq/liter in the sample solution were determined by the potentiometric titration system. This semiautomated direct titration of sulfate has the advantages of increased sensitivity and speed as compared with the precipitation method.

¹ Contribution from the US Salinity Laboratory, SWCRD, ARS, USDA, Riverside, Calif. 92502.

² Chemist and Soil Scientist, respectively, US Salinity Laboratory, Riverside, California 92502.

Received for publication January 4, 1972. Accepted for publication March 13, 1972.