2-[2-(4-甲基喹啉)-偶氮]-5-二乙氨基苯酚固相萃取光度法测定水和食品中的镉  

Solid Phase Extraction and Spectrophotometric Determination of Cadmium with 2-[2-(4-Methylquinolyl)-azo]-5-diethylaminophenol

作　　者：王亮[1] 袁倬斌[1] 胡秋芬[2] 尹家元[2] 杨光宇[2] 

机构地区：[1]中国科学院研究生院应用化学研究所,北京100039 [2]云南大学化学系,昆明650091

出　　处：《分析化学》2005年第3期371-373,共3页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20175025;20235010);科技部"十五"科技攻关重大项目(2001BA210A047)资助课题

摘　　要：研究了新试剂2[2(4甲基喹啉)偶氮]5二乙氨基苯酚(QADP)与镉的显色反应。在pH为8.0的硼酸氢氧化钠缓冲介质中,TritonX100存在下,QADP与镉反应生成2∶1稳定络合物。体系最大吸收波长λmax=590nm,摩尔吸光系数ε=1.56×105L·mol-1·cm-1。样品中的镉用强阴离子交换固相萃取柱固相萃取预分离和富集后用该方法测定,结果令人满意。The color reaction of 2-[2-(4-methylquinolyl)-azo] -5-diethylaminophenol (QADP) with cadmium was studied. In the presence of pH 8. 0 buffer solution and triton X-100 medium, QADP can react with Cd2+ to form a stable 2:1 complex (QADP: Cd(III)). The molar absorptivity is 1. 56 x 10(5) L . mol(-1) . cm(-1) at 590 nm. Beer's law is obeyed in range of 0. 05 similar to 1. 0 mg/L. The cadmium ion in samples can be enriched and separated by solid phase extraction with anion exchange resin cartridge. This method was applied to the determination of cadmium in water, liver and flour with satisfactory results.

关 键 词：氨基苯酚 摩尔吸光系数 X-100 固相萃取柱 固相萃取光度法 甲基 显色反应 喹啉 氢氧化钠 硼酸 

分 类 号：X132[环境科学与工程—环境科学]