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用2—〔(5—溴—2—吡啶)偶氮)—5—二乙氨基苯酚(简称5—Br—PADAP)作为金属指示剂络合滴定测定锌、钼、镍已有报导,但还未见之于滴定测定铅。本文基于以非离子表面活性剂乳化剂OP为增溶剂,用5—Br—PADAP为指示剂,研究了络合滴定测定铅的条件。实验表明,在pH6.4～7.4的乙酸钠介质中,当用EDTA溶液滴定到等当点时,由络合物的紫色变为指示剂本身的亮黄色,终点时突跃明显,适用于矿石及粗铅中铅的测定。
Zinc, molybdenum and nickel have been reported for complexometric titration with 2 - [(5-bromo-2-pyridyl) azo) -5-diethylaminophenol (abbreviated as 5-Br-PADAP) Did not see the titration of lead. In this paper, based on non-ionic surfactant emulsifier OP as solubilizer, 5-Br-PADAP as an indicator, the determination of lead by complexometric titration conditions. Experiments show that in pH6.4 ~ 7.4 sodium acetate medium, titration with EDTA solution to the equivalence point, the complex purple to the bright yellow indicator itself, the end of the sudden jump is obvious, suitable for ore And the determination of lead in lead.