热镀锌合金中微量铈的测定——新显色剂二溴羧基偶氮氟胂光度法  

PHOTOMETRIC DETERMINATION OF MICROAMOUNTS OF CERIUM IN ZINC ALLOY WITH THE NEW CHROMOGENIC REAGENT DIBROMOCARBOXY FLUOROARSENAZO

作　　者：杨姣[1] 谈技[1] 宗俊[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《理化检验（化学分册）》2005年第2期84-86,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：拟定了一种简便、快速测定锌合金中微量铈的方法。在强酸性体系中铈与二溴羧基偶氮氟胂(简称FAsA DBK)形成蓝紫色络合物,其最大吸收波长为632 nm,表观摩尔吸光系数为1 2×105L·mol-1·cm-1,线性范围为0~28μg/25 mL,加标回收率为96.0%~101.8%,该法用于锌合金或中间锌合金材料中微量铈的测定,相对标准偏差小于2.0%。In an acidic solution of 0.14 mol·L^(-1) hydrochloric acid, the new chromogenic reagent dibromocarboxy fluoroarsenazo (abbreviated as FAsA-DBK) reacts with cerium(Ⅳ) to form a bluish violet coordination complex with its Absorption maximum at 632 nm. The apparent molar Absorptivity of this coordination complex was found to be 1.2×10~5L·mol^(-1)·cm^(-1). Beer′s law holds in the range of 0~28 μg of Ce(Ⅳ) per (25 mL) of solution. Based on the results of interference testing, the color reaction was applied to the determination of cerium in zinc alloys successfully.

关 键 词：光度法 FAsA-DBK 铈 锌合金 

分 类 号：O652[理学—分析化学]