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应用氟硅酸钾容量法测定二氧化硅,一个重要的操作环节,是在制备分析溶液时尽可能地防止有胶体硅酸析出。为此,用氢氧化钾熔矿后,以沸水提取熔块,用2％HNO_3洗净坩埚,在不断摇动下立即倾入有30～35毫升HCl(比重1.19)的250毫升容量瓶中,加2毫升HNO_3(比重1.42),小心煮沸1分钟,冷却,然后加水稀释至标线,摇匀,备用。
Application of potassium fluosilicate volumetric method for the determination of silica, an important part of the operation, is to prevent the colloidal silicic acid precipitation in the preparation of the analytical solution. To this end, after mining with potassium hydroxide, the frit is extracted with boiling water, the crucible is washed with 2% HNO 3, and immediately poured into a 250 ml volumetric flask with 30-35 ml HCl (specific gravity 1.19) under constant shaking, plus 2 ml HNO_3 (specific gravity 1.42), carefully boiled for 1 minute, cooled, then diluted with water to the mark, shake, spare.