测定硫铁矿灰或硫铁矿中全铁,工业上通常采用经典重铬酸钾容量法,即在盐酸介质中,以氯化亚锡还原Fe~(3+),用水稀释后,加入氯化汞消除过量亚锡离子,再加入硫磷混酸和二苯胺磺酸钠指示剂,立即用重铬酸钾标准溶液滴定。因该法简便、准确,故被公认为测定铁的最好方法。但该法使用剧毒的汞盐,从环境保护着眼,所造成的环境 Determination of total iron in pyrite ash or pyrite, the industry usually uses the classical potassium dichromate capacity method, that is hydrochloric acid medium, with stannous chloride reduction Fe ~ (3 +), diluted with water, add chlorine Hg to eliminate excessive stannous ions, and then add phosphoric acid and sodium diphenylamine sulfonate indicator, immediately titrate with potassium dichromate standard solution. Because of the method is simple and accurate, it is recognized as the best method of determination of iron. But the law uses highly toxic mercury salts, from the environmental protection eyes, the resulting environment