Micro-determination of soluble silica in urine

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Abstract
An accurate and cepro-ducible method of determining small amounts of silica in rat and human urine is described. The method involves precipitating the bulk of the phosphate present in urine, by calcium chloride and ammonia at pH 7.0, and removing the remaining phosphate by selective extraction of the phosphomolybdate with ethyl acetate. Silica was then determined in the aqueous phase after reduction of the silicomolybdate by l-amino-2-naphthol-4-sulphonic acid reagent in the presence of citric acid. The method is capable of general applicability to determinations of trace amounts of silica in high concentrations of phosphate.
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