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硅石的快速化学分析主要困难在于如何能迅速制备纯净、均匀的样品溶液作为各种测定之用,特别在作硅石的比色测定时,样品溶液的制备是有一定的困难的。美国某实验室采用一种快速而简便的方法来制备硅样水溶液,在一般测定中没有引起任何显著干扰,因此可以用来改进现行的方法。具体步骤如下: 秤取200目的样品0.1克于55毫升的平底铂皿中,加0.5克无水偏硼酸锂(LiBO_2),混合均匀,在氧焰上加热5～10分钟,俟熔融完全,将仍呈暗红色的铂皿放入容量为250毫升的盛有125毫升2%硝酸的烧杯中,再在该烧杯中倾注2%硝酸,使铂皿沉至杯底,
The main difficulty of rapid chemical analysis of silica lies in how to prepare pure and homogeneous sample solution rapidly for various determination purposes. Especially when preparing silica for colorimetric determination, it is difficult to prepare sample solution. A laboratory in the United States uses a quick and easy method to prepare a silica-like aqueous solution that does not cause any significant interference in the general assay and can therefore be used to improve the current method. Specific steps are as follows: Weigh 200 mesh sample 0.1 g in 55 ml of flat bottom platinum dish, add 0.5 g of anhydrous lithium metaborate (LiBO_2), mix well and heat on the oxygen flame for 5 to 10 minutes, 俟 melt completely, The still dark red platinum dish is placed in a 250 ml beaker containing 125 ml of 2% nitric acid and poured into 2% nitric acid in the beaker to allow the plate to settle to the bottom of the cup,