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1.引言本文采用络合滴定法(硫脲析出法)测定合金中的铜,具有很高的选择性和准确性。基体银预先分离,钒和锫在确定条件下不干扰,本法终点变化敏锐,精确度高,测定误差≤0.1％,是测定合金中铜的准确、可靠的方法。 2.试剂铜标准溶液:称取电解铜(99.99％)0.2000克,置于250毫升烧杯中,加硝酸10毫升,溶解后蒸发至3～5毫升,溶液移入100毫升容量瓶内,冷却至室温,用水稀释。锌标准溶液:准确称量金属锌(99.99％)1.0000克,置于250毫升烧杯中,用硝酸
1. Introduction In this paper, complexation titration (thiourea precipitation method) determination of copper in the alloy, with high selectivity and accuracy. Pre-separation matrix silver, vanadium and 锫 do not interfere with the determination of the conditions of this Law sharp changes in the end, high accuracy, determination of error ≤ 0.1%, is the determination of copper in the alloy is accurate and reliable method. 2. Reagent copper standard solution: Weigh 0.2000 g of electrolytic copper (99.99%) and place in a 250 ml beaker. Add 10 ml of nitric acid, dissolve and evaporate to 3 to 5 ml. Transfer the solution to a 100 ml volumetric flask and cool to room temperature , Diluted with water. Zinc standard solution: Accurately weigh 1.0000 grams of metallic zinc (99.99%), place in a 250 ml beaker,