Verfahren zur Auflösung von Silikaten

摘要

The method of solubilising silica in an aqueous system involves diluting an aqueous silica-containing sample to provide an expected detectable silica level. One or more chelants are added until the pH of the sample is above 10.0. Preferably, the chelants are selected from the group consisting of ethylenediamine tetraacetic acid, nitrilotriacetic acid, N-(hydroxyethyl)-ethylenediamine triacetic acid, aminotris(methylenephosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, diethyene triamine pentamethylene phosphonate, diethylenetriamine pentaacetic acid, triethanolamine, ethylenediamine tetra(methylenephosphonic acid), hexamethylenediamine tetra(methylene phosphonic acid), and the partial and complete alkali metal and ammonium salts thereof.