三溴偶氮氟胂分光光度法测定热镀锌合金中微量铈  

Determination of micro cerium in hot-dipped zinc alloy with tribromo-fluoroarsenazo by spectrophotometry

作　　者：谈技[1] 杨姣[1] 宗俊[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《冶金分析》2004年第6期52-54,共3页Metallurgical Analysis

摘　　要：在 pH 1 5的盐酸介质中 ,铈与三溴偶氮氟胂形成紫红色络合物 ,λmax=62 8nm ,ε=1 2 0× 10 5,据此建立了三溴偶氮氟胂分光光度法测定锌合金中微量铈的新方法。在 2 5mL溶液中 ,铈质量在 0～ 2 8μg范围符合比尔定律。大量Zn2 + 不干扰测定 ,合金中锡的干扰可以通过溶样消除。测定铈质量分数大于 0 0 0 1%样品时 ,相对标准偏差小于 9 2 6% ,加入标准溶液的回收率为 87%～ 10 2 2 %。该法快速、简单 。In the medium of hydrochloric acid at pH 1.5,Ce*$ can react with tribromo-fluoroarsenazo (abb.TB-5FA) [2-(5-fluoro-2-phenyl-(azoarsenate))-7-(2,4,6-tribromo)-1,8-dioxynaphtho-3,6-disulfonic acid] to form a violet red complex.The maximum absorbance was at 628 nm with molar absorptivity of 1.20×10~5 L·mol^(-1)·cm^(-1).Based on this,a satisfactory spectrophotometic method for the determination of cerium *$ in hot-dipped zinc alloy was established. Beer's law was obeyed in the range of 0～28 μg/25 mL for cerium.A great deal of zinc ion has no interference and the interference of stannic ion can be eliminated by converting it into the deposition of stannic acid. The recoveries of standard addition are in the range of 87%～102.2% and the RSD (for w(Ce*$)≥0.001%) is below 9.26%.

关 键 词：热镀锌合金 溶样 盐酸介质 微量 相对标准偏差 快速 质量分数 分光光度法 比尔定律 测定 

分 类 号：TG115[金属学及工艺—物理冶金]