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在约0.2N盐酸中用氢式强酸性阳离子交换树脂吸附除去黄色阳离子(主要是高铁离子)。加氟盐解聚聚合硅酸后,在pH3～4使硅酸根形成黄色硅钼络合物H_4[Si(MO_3O_(10)_4],进行比色测定,方法可测矿石中低、中、高含量的二氧化硅。试剂:用高纯SiO_2按矿样分析手续制备标准溶液;氟化钠、氢氧化钠,钼酸铵溶液均贮备于聚乙烯
Yellow cations (mainly ferric ions) are removed by adsorption with hydrogen strong acid cation exchange resin in about 0.2N hydrochloric acid. Fluoride salt depolymerization polymerization of silicic acid, the silicate yellow-molybdenum complex H_4 [Si (MO_3O_ (10) _4] is formed at pH 3-4, and the colorimetric determination is carried out. The method can be used to measure the content of low, medium and high Content of silica. Reagents: Preparation of standard solution by high purity SiO 2 mineral sample analysis procedures; sodium fluoride, sodium hydroxide, ammonium molybdate solution are stored in polyethylene