氯乙酸缓冲体系在稀土测定中的应用研究  

Research on Buffer Solution of Chloroacetic Acid in Rare Earth Detection

作　　者：张燕辉[1] 杜若冰[1] 王振兴[1] 陆人杰[1] 毛婷婷[1] 肖吉昌[1] 

机构地区：[1]中国科学院上海有机化学研究所有机氟化学重点实验室,上海200032

出　　处：《中国稀土学报》2013年第5期636-640,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家973计划项目(2012CBA01200)资助

摘　　要：研究了氯乙酸/氢氧化钠缓冲体系在分光光度法测定稀土中的应用。以偶氮胂Ⅲ(0.5 g·L-1)为显色剂,比较了氯乙酸/氢氧化钠、甲酸/氢氧化钠、乙酸/乙酸纳缓冲体系灵敏度的差异,考察了pH值、偶氮胂Ⅲ对摩尔吸光系数的影响。并在氯乙酸/氢氧化钠体系下确定了测定单一稀土元素的最佳条件(缓冲溶液为氯乙酸/氢氧化钠,加入量为2 mL;显色剂为偶氮胂Ⅲ,加入量为2 mL),找到了测定每种稀土元素的最佳pH值。分光光度法与ICP-AES法测试基本吻合,可以简捷快速地测定稀土元素总量。The chloroacetic acid/sodium hydroxide buffer system was applied in the determination of rare earth by photometric analysis. With Arsenazo m as chromogenic reagent, the sensitivity of various buffer systems was explored, including chloroacetic acid/so- dium hydroxide, formic acid/sodium hydroxide and acetic acid/sodium acetate. The optimal conditions for the determination of lanthanide ions in chloroacetic acid were found and the corresponding molar absorp- tivities, were calculated. The results of photometric a- nalysis which can be determined simply and quickly, were agree with the data of ICP-AES

关 键 词：氯乙酸 分光光度法 稀土 

分 类 号：O652.1[理学—分析化学]