标准摘要
[中文适用范围]： 该程序基于预先用盐酸酸化的测试部分的蒸发至干燥。 溶解可溶盐，过滤并洗涤不溶物。 滤液与洗液在相同条件下二次蒸发，进一步溶解可溶性盐，过滤、洗涤。 同时煅烧和称量两批不溶物。 与氢氟酸和硫酸一起加热使二氧化硅挥发，并称量煅烧后的残留物。 这;质量差代表测试部分中存在的二氧化硅。 [外文原描述]： The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The*difference in mass represents the silica present in the test portion.
英文名称Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric method by insolubilization