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本文用EDTA掩蔽镍合金中基体镍;硫脲在酸性溶液中掩蔽铜合金中铜,银合金中银,同时将铁还原。可直接测定镍合金,铜合金,银合金中铁。一试剂与仪器铁标准溶液:称取纯铁0.2000克溶于稀硝酸中,移入100毫升量瓶中,以水定容(2mg·ml~(-1)),取此溶液稀释10倍为20μg Fe·ml~(-1)。邻菲罗啉溶液:0.2%,称取试剂0.2克,加乙醇5毫升溶解,以水稀至100毫升。乙酸-乙酸钠缓冲溶液:pH5.8,称无水乙酸钠164克,加冰乙酸12毫升,以水溶解并稀至1升。 721型分光光度计。二试验方法取40微克铁的标准溶液于50毫升量瓶中,加抗坏血酸溶液(1%)5毫升,EDTA溶液(2%)10毫升,缓
This paper masks the matrix nickel in nickel alloy with EDTA; thiourea masks the copper in the copper alloy and the silver in the silver alloy in an acidic solution, and simultaneously reduces the iron. Direct determination of nickel alloy, copper alloy, silver alloy iron. A reagent and instrument iron standard solution: Weigh 0.2000 grams of pure iron dissolved in dilute nitric acid, into 100 ml volumetric flask (2mg · ml ~ (-1)), take this solution diluted 10 times 20μg Fe · ml ~ (-1). Phenanthroline solution: 0.2%, weighed reagent 0.2 g, add ethanol 5 ml dissolved, diluted with water to 100 ml. Acetic acid - sodium acetate buffer solution: pH5.8, said anhydrous sodium acetate 164 g, add glacial acetic acid 12 ml, dissolved in water and dilute to 1 liter. 721 spectrophotometer. Two test methods Take 40 micrograms of iron standard solution in 50 ml volumetric flask, add ascorbic acid solution (1%) 5 ml, EDTA solution (2%) 10 ml, slow