摘要
本文详细研究了锆与DBC—偶氮氯膦及溴代十六烷基三甲铵形成三元配合物的最佳条件。其最大吸收峰为650nm,表观摩尔吸光系数为6.3×10~4。配合物显色反应的允许酸度较高,选择性较好,测定10μg锆时的两价金属离子和钨、钼等高价离子可允许存在毫克量。在750nm波长测定时,可避免较大量钙、钡和稀土,钍等元素的干扰,该体系应用于各种合金中锆的测定,取得了满意的结果。
Zirconium forms a blue-violet ternary complex with chlorophosphonazo-DBC and cetyltri-methyl ammonium bromide in acidic solution. This complex exhibits absorption maximum at650nm with apparent molar absorptivity of 6.3×10~4 L mol^(-1). cm^(-1). The selectivity of thiscolour reaction is good. W(Ⅵ), Mo(Ⅵ) and a number of diverse ions do not interfere in thedetermination of Zirconium. Only rare earth and alkaline earth would have interfering effect.it can be avoided by measuring the absorbance at 730nm. The method described here has beensuccessfully applied to direct determination of zirconinm in cupper alloy, zinc-magnesiumalloy and aluminium alloy.
