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This method is for the determination of micro amounts of silica in aqueous solutions. Not all silica species can be determined by this method, but the more common water-soluble forms can be determined (see Note 2). The concentration of silica should not exceed 0.7 micrograms per milliliter in the final colored solution.
ASTM UOP792-78, The Colorimetric Determination of Silica in Aqueous Solutions, ASTM International, West Conshohocken, PA, 2002, www.astm.orgBack to Top