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高纯材料中微量硅的测定,目前仍以硅钼兰比色法为最灵敏,并得到了广泛的应用。如高纯水里硅的测定就是以硅钼兰法作为标准法。因为硅是一种最常见的元素,易受环境、试剂、器皿等的污染,所以工作中遇到的困难就是空白大的问题,我们用聚乙烯塑料管自制的比色管和吸液管,及用聚四氟乙烯蒸馏器蒸馏试剂,解决了本工作范围内的空白问题,并对影响硅钼钢兰形成的温度、时间、溶液的pH值和测量波长进行了试验,确定了较佳的分析条件。本方法检测限可达 6×10~(-6)％,变异系数为29％。
Determination of trace silicon in high purity materials, silicon molybdenum blue colorimetric method is still the most sensitive, and has been widely used. Such as the determination of silicon in high-purity water is silicon molybdenum blue method as the standard method. Because silicon is one of the most common elements, it is easily polluted by the environment, reagents, utensils, etc. Therefore, the difficulties encountered in the work are the big blank. We use colorimetric tubes and pipettes made of polyethylene plastic tubes, And distilling the reagent with the teflon distiller, solves the blank problem in the working range, and tests the temperature, the time, the solution pH value and the measuring wavelength which affect the molybdenum blue, and determines the better Analysis conditions. The detection limit of this method can reach 6 × 10 -6%, and the coefficient of variation is 29%.