在乙醇存在下对乙酰基偶氮氯膦与钙的显色反应研究  

Spectrophotometric Determination of Calcium with p-Acetylchlorophosphonazo in the presence of Ethanol

作　　者：赵书林[1] 夏心泉[1] 马厚蓉[1] 

机构地区：[1]沈阳化工学院高分子化工系

出　　处：《冶金分析》1995年第5期7-9,共3页Metallurgical Analysis

摘　　要：本文研究了在乙醇存在下，对乙酰基偶氮氯膦与钙的显色反应。在弱酸性介质中及大量乙醇存在下，钙与对乙酰基偶氮氯膦形成络合比为１：２蓝色络合物，最大吸收波长在６５５ｎｍ处，表观摩尔吸光系数为４．３×１０４，钙的浓度在０～２０μｇ／２５ｍｌ符合比尔定律。所提出的方法已用于硅铁中微量钙的测定，结果满意。A new method for the spectrophotometric determination of calcium with p-acetylchlorophosphonazo in the presence of ethanol has been developed. In weak acid medium, calcium forms blue complex with p-acetylchlorophosphonazo in the presence of ethanol, and the ratio of calcium to p-acetylchlorophosphonazo has been found to be 1:2, The complex exhibits maximum absorption at 655 nm and the apparent molar absorptivity is 4.3×10￣4 L·mol￣-1·cm-1 Beer's law is obeyed for calcium concentration of 0 to 0.8μg/ml. The method was applied to the determination of calcium in ferrosilicon with satisfactory results.

关 键 词：光度法 钙 硅铁 显色剂 显色反应 CPApA 乙醇 

分 类 号：TF645[冶金工程—钢铁冶金] TF031