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本法以硫脲掩蔽Cu~(2+)。并同时将铁还原为二价,再以邻菲罗啉将Fe~(2+)显色。操作简单,方法准确且快速。主要试剂 pH3缓冲溶液:称13.6克NaAc·3H_2O溶于水并稀至500毫升。另将28毫升浓硫酸加入水中稀至500毫升。二者相混合。邻菲罗啉液:0.5%,称邻菲罗啉0.5克溶于2毫升HCl(1+1)中稀至100毫升。铁标液:0.1克纯铁加HNO_3(1+3)10毫升溶解,在100毫升量瓶中以水稀至刻度(0.01mgFe/ml)。检量线称0.5克电解铜,加入HNO_3(1+1)10毫升溶解,
This method uses thiourea to mask Cu ~ (2+). At the same time, the iron is reduced to divalent, and then Fe ~ (2+) is colored with phenanthroline. Simple operation, accurate and fast method. The main reagent pH3 buffer solution: Weigh 13.6 g NaAc · 3H_2O dissolved in water and diluted to 500 ml. Another 28 ml of concentrated sulfuric acid diluted to 500 ml of water. The two mix. Phenanthroline o-phenanthroline: 0.5%, said 0.5g of phenanthroline dissolved in 2 ml of HCl (1 + 1) diluted to 100 ml. Iron standard solution: Dissolve 0.1 g pure iron and 10 ml HNO3 (1 + 3) and dilute to the mark (0.01 mg Fe / ml) with water in a 100 ml volumetric flask. Calibration line, said 0.5 grams of electrolytic copper, add HNO_3 (1 +1) 10 ml dissolved,