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氧化铝常用作催化剂的担体或各种填料,需要对其中钠、硅等杂质进行分析,过去采用碱熔或浓酸在白金皿中处理成溶液后,进行测定,但手续繁杂,时间长,且易污染,对于低于20ppm金属杂质的测定结果误差大。采用高压能缩短溶解时间,并有助于难溶物(如硅)的溶解,原子吸收法灵敏度高,可以减少样品用量,也可以使样品予处理工作简化。近年来有各种高压釜在国际市场上出现。本文参考其原理,自行设计高压釜,用来分解各类氧化铝,溶液用原子吸收法测定铂、锡、硅、铁、钠和铜。
Alumina is often used as a catalyst support or a variety of fillers, which need to sodium, silicon and other impurities for the analysis of the past, the use of alkali melt or concentrated acid in Platinum dish into a solution after the determination, but the procedure is complicated, long time and Easily polluted, for less than 20ppm metal impurity measurement results error. The use of high pressure can shorten the dissolution time and help to dissolve insoluble substances (such as silicon). The high sensitivity of atomic absorption spectrometry can reduce the amount of sample used, and simplify the sample processing. In recent years, there are various autoclaves in the international market. In this paper, reference to its principle, self-designed autoclave, used to decompose various types of alumina, solution Determination of platinum, tin, silicon, iron, sodium and copper by atomic absorption method.