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本法基于K_2SiF_6沉淀后,不过滤分离,用KOH溶液中和母液中的酸至中性,当溶液中存在适量的F~-和K~+离子时,它们既能抑制K_2AlF_6等干扰物质的水解,又不影响K_2SiF_6完全水解.避免了现行K_2SiF_6法过滤分离的麻烦手续,防止了因转移和洗涤时K_2SiF_6的部分损失引起的负误差,消除了因可能产生K_2AlF_6沉淀引起的正误差.其准确度不低于动物胶重量法.用本法测定标准样品,标准偏差在0.20～0.24%间.为测定含SiO_2在40～80%的瓷用硅酸盐样品提供了一个准确快速的方法.
This method is based on the precipitation of K_2SiF_6, and it is not separated by filtration. The acid in the mother liquor is neutralized by KOH solution. When the solution contains F ~ - and K ~ + ions, they can both inhibit the hydrolysis of K_2AlF_6 and other interfering substances , Without affecting the complete hydrolysis of K 2 SiF 6, avoiding the cumbersome procedure of K 2 SiF 6 filtration and separation, preventing the negative error caused by the partial loss of K 2 SiF 6 during transfer and washing, and eliminating the positive error caused by K 2 AlF 6 precipitation. Not less than the animal glue gravimetric method.Determination of standard samples by this method, the standard deviation of between 0.20 ~ 0.24% for the determination of SiO 2 in 40 ~ 80% porcelain samples with silicate provides an accurate and rapid method.