DETERMINATION OF SULFATE IN NATURAL-WATERS AND INDUSTRIAL EFFLUENTS BY SEQUENTIAL INJECTION-ANALYSIS

A sequential injection analysis system for the determination of sulpha te in natural waters and industrial effluents has been developed. The method is based on the turbidimetric determination of sulphate using b arium chloride as reagent and measuring the absorbance of the formed s uspension spectrophotometrically at 540nm. The proposed system is full y computerised and is able to monitor sulphate in samples at a frequen cy of 26 samples per hour with a relative standard deviation of better than 3.9%. The calibration graph is linear between 10 and 200 mg l(-1 ).