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本文提出用十六烷基三甲基溴化胺（ＣＴＭＡＢ）作为重量法测定湿法磷酸中的二氧化硅的凝聚剂，在大量五氧化二磷存在下，重量法测定小量的二氧化硅，得到令人满意的结果。
In this paper, cetyltrimethyl ammonium bromide (CTMAB) was used as the gravimetric reagent for the determination of silica in wet-process phosphoric acid. In the presence of a large amount of phosphorus pentoxide, a small amount of silica , Get satisfactory results.