对乙酰基偶氮胂与钙显色反应的研究及分析应用

A Study on Colour Developing Reaction for Calcium with p—Acetylarsenazo

以对乙酰基偶氮胂(ASApA)为显色剂,建立了钙的分光光度分析新方法。在pH10.0介质中,Ca与ASApA生成1:2(配合比)螯合物,最大吸收波长位于626nm,摩尔吸光系数ε_(max)=1.11×10~4L·mol^(-1)·cm^(-1),Ca量在1～15μg/25ml范围内遵守Beer定律。方法用于水样中痕量Ca测定,得到了满意的结果。

A sensitive spectrophotometric method was developed for the determination of trace calcium using the title reagent as developing reagent. At pH 9.8 to 11.8, Calcium with p—acetylarsenazo forms a complex with maxmium absorption at 626 nm, the composition of the complex is 1:2 (M:R). The apparent molar absorptivity is ε_(max)=1.11×10~4L·mol^(-1)·cm^(-1). Beer's law is obeyed in the range of 1～15μg/25ml. The method has been successfully applied to the practical analysis of water samples with satisfactory results.