二溴对甲基偶氮磺光度法测定金属锌中微量铅  

Dibromo-P-methylsulfonazo determinate micro lead of Zinc by spectrophotometry

作　　者：钟国秀[1] 黄清华 

机构地区：[1]湖北省机电研究设计院,湖北武汉430070 [2]湖北省建材研究设计院,湖北武汉430071

出　　处：《南方金属》2007年第6期23-24,共2页Southern Metals

摘　　要：研究二溴对甲基偶氮磺与铅的反应，建立了直接测定金属锌中铅含量的光度分析方法．在0．144mol／L盐酸介质中，铅与二溴对甲基偶氮磺形成蓝色配合物，最大吸收波长为630nm，表观摩尔吸光系数为8．34×10^4；在25ml的溶液中，铅量在0-60μg范围内符合比尔定律．显色反应具有很好灵敏度和选择性，主要共存离子均有较大允许量．可用于金属锌中铅的直接测定，测定结果与理论值相符，RSD为1．85％-2．56％．The chromogenic reaction between the reagent dibromo-P-methylsulfonazo and lead was studied. In 0. 144 mol/ L HCl medium, lead reacts with the reagent to form a blue complex which exhibits an absorption maximum at 630 nm with a apparent molar absorbtivity of 8.34 × 10^4 L mol^-1 cm^-1 , Beer,s law was obeyed in the range of 0-60 μg/25 ml for lead. Most of common coexisting ions did not interfere with the determination of lead. The proposed method has been applied to the direct determination of lead in Zinc; the results are conforming to certified values. The RSD （n = 5 ） is not more than 3%.

关 键 词：二溴对甲基偶氮磺 锌 铅 分光光度法 

分 类 号：TG115.31[金属学及工艺—物理冶金]