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用二氯化锡将铁还原,加入二氯化汞后,重铬酸钾滴定铁是个准确、快速的方法,因其中用汞,污染环境,故近来都在找寻无汞测铁的方法,如用硅钼酸为指示剂控制还原,用铝片还原,硫化氢还原,氯化亚锡滴定后碘酸钾反滴定,钛还原等方法。但均不如二氯化汞的重铬酸钾容量法方便、准确,因而未能推广使用。本文研究了以甲基橙代替二氯化汞,重铬酸钾滴定的测定铁的方法。主要利用甲基橙在盐酸介质中被二氯化锡不可逆的还原为无色物,可从
With tin dichloride reduction of iron, after the addition of mercury dichloride, potassium dichromate titration of iron is an accurate and rapid method, which uses mercury, polluting the environment, it has recently been looking for mercury-free method of measuring iron, such as With silicomolybdic acid as an indicator to control the reduction, with aluminum reduction, hydrogen sulfide reduction, stannous chloride titration potassium iodate titration, titanium reduction and other methods. However, they are not as convenient and accurate as the potassium dichromate capacity method of the two mercuric chloride and therefore can not be popularized. In this paper, methyl orange instead of mercuric chloride, potassium dichromate titration method for the determination of iron. The main use of methyl orange in hydrochloric acid was irreversible tin dichloride reduction to colorless, available from