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.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2005年第2期84-86,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
