An improved turbidimetric procedure for the determination of sulphate in plants and soils

A rapid turbidimetric procedure for the determination of sulphate in soils and plants has been developed with sorbitol as stabilizing agent. When used in a concentration of 20% in the final volume, the sorbitol regulates the size of the BaSO(4) particles formed and stabilizes them against sedimentation, growth and aggregation for long periods of time. The conditions of precipitation are not rigorous, as they are in similar procedures. Linearity of the calibration curve up to 50 ppm of sulphate and good reproducibility are special attributes of the procedure.