Browsing by Author "Ristow, N E"

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    Sulphate measurement in organic-rich solutions: Carbonate fusion pretreatment to remove organic interferences
    (2005) Ristow, N E; Sotemann, S W; Wentzel, M C; Loewenthal, R E; Ekama, G A
    Sulphate measurement using a barium sulphate turbidimetric method in solutions with high concentrations of organic material is shown to be problematic. The organics give background colour, which introduces a positive error to the measured absorption, and inhibit the barium sulphate precipitate, which results in a negative error. A carbonate fusion pretreatment of the sample results in the removal of the organic matter and associated interferences. With this pretreatment, excellent sulphate recoveries were obtained (100%). Rigorous testing of the method shows that reproducible and accurate results are obtainable.