Sulphate measurement in organic-rich solutions: Carbonate fusion pretreatment to remove organic interferences
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2005
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Water SA
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University of Cape Town
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Abstract
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.
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Ristow, N. E., Sötemann, S. W., Wentzel, M. C., Loewenthal, R. E., & Ekama, G. A. (2005). Sulphate measurement in organic-rich solutions: Carbonate fusion pretreatment to remove organic interferences. Water SA, 31(2), 267-270.