催化动力学光度法测定超痕量镍(Ⅱ)的研究

STUDY ON THE DETERMINATION OF TRACE Ni(Ⅱ) BY CATALYTIC KINETIC-SPECTROPHOTOMETRY

研究发现在醋酸介质中，超痕量的镍（ Ⅱ） 能催化过氧化氢和溴酸钾氧化二甲苯兰ＦＦ 褪色。通过研究该反应的最佳条件和动力学参数，建立了测定超痕量镍（ Ⅱ） 的新方法。该方法检测限为２ ．３３ ×１０ － ７ ｇ 镍（ Ⅱ）／Ｌ，测定范围为０ ～４ ．８ μｇ 镍（ Ⅱ）／Ｌ，用于测定环境中镍（ Ⅱ） ，获得满意结果。

It has been observed that Ni(Ⅱ) can sensitively catalyze the reaction of H 2O 2 and KBrO 3 oxidating discoloration of the Xylene cyanol FF in ethanoic acid solution.The kinetics mechanism of the reaction was investigated in detail and a new method for the determination of trace Ni(Ⅱ) was proposed.The detection limit is 2.3×10 -7 g/L and the linear range is 0.0-0,80 μg/L of Ni(Ⅱ).It has been applied satisfactorily to the determination of trace Ni(Ⅱ) in the waste water.