Abstract
Abstract A segmented flow system is described for a simple and sensitive automated method for measuring sulphate in several acidic and neutral matrixes. The procedure was based on the turbidimetric measurement of barium sulfate (BaSO4) precipitation. Gelatine is included in the barium chloride (BaCl2#lb2H2O) solution to stabilise the suspended precipitate. Taking into consideration the nature of the matrix, this method can be used to measure sulphate concentration in water, in acid extracts of soils (phosphoric or acetic acids), and in very acid digestion of plant material (perchloric acid). The ranges of concentrations are also variable: (i) up to 10 mg/L without a dilution step, and (ii) up to 100 mg/L with automatic dilution of the sample. To reduce sensitivity or overcome interferences, a dialyser must be included in the system for higher concentrations and/or coloured samples.
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