5-Br-PADAP分光光度法测定环境水样中微量铀

Spectrophotometric determination of trace uranium in sample of environment water with 5-Br-PADAP

在三乙醇胺 -HCl介质中 ,有OP存在下 ,5 -Br -PADAP与铀 (Vl)生成红色络合物 ,其最大吸收波长为 5 3 5nm ,表观摩尔吸光系数为 1.0 1× 10 5L·mol-1·cm-1,含铀 0～ 3 2 0 μg/L范围符合比耳定律 方法灵敏度高 ,快速简便 ,使用磷酸纤维素分离以提高方法的选择性 ,分析环境水样中微量铀 ,结果满意 图 1,表 1,参

In the medium of triethanolamine-hydrochloric acid,a red complex of uranium with 5-[(5-bromo-2-pyridyl)-azo]-5-diethylaminophenol(5-Br-PADAP) is formed in the presence of OP. The complex has a maximum absortion wavelength at 535nm. The apparent molar absorptivity is 1.01×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed in the range from 0-320 μg/L for uranium .The method possess advantages of high sensitivity, simplicity and rapidity. The selectivity was risen by seperation foreign ions using phosphorylated cellulose. It is applies to the determination of trace uranium in sample of environment water with satisfactory results.1fig.,1tab.,6refs.