DApAM-Ce(Ⅳ)-Mn(Ⅱ)-NTA-β-CD体系光度法测铈  

Spectrophotometric determination of cerium with DApAM-Ce(Ⅳ)-Mn(Ⅱ)-NTA-β-CD system

作　　者：黄章杰[1] 胡秋芬[2] 尹家元[2] 徐其亨[2] 

机构地区：[1]云南大学科技处,昆明650091 [2]云南大学化学系,昆明650091

出　　处：《分析试验室》2002年第2期76-78,共3页Chinese Journal of Analysis Laboratory

基　　金：云南省教育厅科学研究基金资助课题 (批准号 :9911147)

摘　　要：在磷酸介质中 ,在Mn(Ⅱ )和氨三乙酸存在下 ,β 环糊精 (β CD)对Ce(Ⅳ )氧化二安替比林基 对氨基苯基甲烷 (DApAM)的显色反应具有明显的增稳和增敏作用 ,据此建立了测定铈的光度法体系。反应产物至少可稳定 6h ,最大吸收波长λmax=5 4 0nm ,ε=7.74× 1 0 5L·mol- 1 ·cm- 1 ,Ce(Ⅳ )量在 0 .5 μg/ 2 5mL～ 4.0μg/ 2 5mL 范围内具有线性关系 ,已用于银基合金中微量铈的测定。A spectrophotometric method for determination of cerium (Ⅳ) was established. The method was based on color reaction of Ce(Ⅲ) with diantipyryl(p-amino)-phenylmethane(DApAM) β-Cyclodextrin had a great sensitizing and stabilizing effect on the color system in the presence of nitrilotriacetic acid and Mn(Ⅱ) in phosphoric acid medium. The maximum absorbance the product was at 540nm with molar absorptivity of 7.74×10 5 L·mol -1 ·cm -1 . The linear range of determination is 0.5～4.0 μg/25 mL for Ce(Ⅳ). The method was applied to the determination of trace amounts of cerium in silver alloy with satisfactory results.

关 键 词：二安替比林基-对氨基苯基甲烷 光度法 铈 Β-环糊精 测定 微量分析 

分 类 号：O614.332[理学—无机化学] O657.32[理学—化学]