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.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
1997年第2期14-16,13,共4页
Metallurgical Analysis
关键词
钙
乙醇
增效作用
水分析
DBC-CPA
显色反应
Calcium
DBC-chlorophosphonazo
Ethanol
Enhancement effect
Dual-wavelength spectrophotometry
