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BS 2690-104:1983 Methods of testing water used in industry. Silica: reactive, total and suspended
standard by BSI Group, 11/30/1983
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Reactive silica by formation of molybdosilicic acid, reduction to molybdenum blue and spectrophotometric measurement. Applicable to up to 50 g of SiO$d2 in up to 100 ml. Total silica by prior fusion to reactive silica. Applicable to up to 50 g of SiO$d2 in up to 50 ml. Suspended silica by prior filtration and fusion. Applicable to up to 50 g of SiO$d2 in up to 1 L.Cross References:
BS 2690:Part 100