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半微量分析具有与常量分析法同样的准确度,且比常量法节省试剂,方便操作,缩短分析时间等优点,因此,受到广泛的重视。本法基于籍硫磷混酸分解试料后,加入一定量盐酸,以钨酸钠为还原铁的指示剂,用氯化亚锡——三氯化钛还原至试液出现兰色,然后加入水籍水中溶解氧氧化过量的三氯化钛,以二苯胺磺酸钠为指示剂,用硫酸铈标准溶液滴定。方法简便、快速,适用于含铁1%以上试料的分析。在本法测定条件下,30毫克砷、锑;20毫克铬、锰;10毫克钴、镍;5毫克铋、
Semi-micro analysis has the same accuracy as the constant analysis method, and saves the reagent more than the constant method, facilitates the operation and shortens the analysis time and so on. Therefore, the semi-micro analysis has received extensive attention. This method is based on Phoxim mixed acid decomposition samples, adding a certain amount of hydrochloric acid, sodium tungstate as an indicator of reduced iron, stannous chloride - titanium trichloride reduction to the test solution blue, and then add water In the water of dissolved oxygen oxidation of titanium trichloride to diphenylamine sulfonate as an indicator, titration with cerium sulfate standard solution. The method is simple, rapid and suitable for the analysis of more than 1% of iron. 30 mg of arsenic and antimony, 20 mg of chromium and manganese, 10 mg of cobalt and nickel, 5 mg of bismuth,