乙醇对钙与DBC-偶氮氯膦显色反应增效作用的研究  

Enhancement Effect of Ethanol on Colour Reaction of Calcium with DBC-Chlorophosphonazo

作　　者：王丽华[1] 彭延湘[1] 邵光玓 

机构地区：[1]北京科技大学化学系,北京100083

出　　处：《冶金分析》1997年第2期14-16,13,共4页Metallurgical Analysis

摘　　要：乙醇对 DBC-偶氮氯膦与钙的显色反应有明显的增效作用。在40%乙醇存在下,显色反应的 pH 范围加宽,试剂空白值稳定,工作曲线的线性范围扩大,灵敏度提高40%以上。用双波长分光光度法测定时,线性关系得到改善,灵敏度进一步提高。拟定了天然水中钙的直接测定法,结果满意。Ethanol has enhancement effect on colour reaction of calcium with DBC-chlorophosphonazo.In the presence of 40% ethanol,pH range of the colour reaction is expanded and absorbance of reagent blank is stable,linear range of the working curve is obviously expanded and sensitivity is increased by a factor of 1/2.4.By means of dual-wavelength spectrophotometry,the linear relationship is improved and sensitivity is further increased.A method has been developed for direct determination of calcium in natural water with satisfactory results.

关 键 词：钙 乙醇 增效作用 水分析 DBC-CPA 显色反应 

分 类 号：O614.231[理学—无机化学] O661.1[理学—化学]