Abstract
The effects of up to 2500 mg 1 −1 of pure cationic, anionic and nonionic detergents, industrially prepared detergents, sodium tripolyphosphate, sodium pyrophosphate and a soap on the analysis of silica in water using the amino-naphthol-sulphonic acid, sodium sulphite and ascorbic acid methods were investigated. Interferences were very large for the cationic and nonionic detergents, but negligible for the biodegradable (LAS-type) detergents. The amino-naphthol-sulphonic acid method is recommended.
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