Study on Solid Phase Extraction and Spectrophotometric Determination of Uranium in Environmental Water with 2-[2-(4-Methylquinolyl)-azo]-5-Diethylaminophenol

Hu Qiufen1,2, Huang Zhangjie2, Li Haitao1,   Yang Guangyu2, Yin Jiayuan2
(1 Department of Chemistry, Yuxi Teacher’s College, Yuxi 653100)
(2 Department of Chemistry, Yunnan Univwrsity, Kunming 650091)

Abstract The color reaction of 2-[2-(4-methylquinolyl)-azo]-5-diethylaminophenol (QADP) with uranium was studied. In the presence of pH=7.8 buffer solution, when fluoride ion and TritonX-100 medium existed, QADP can react with uranium and fluoride ion to form a 1/1/1 stable complex {F-/QADP/U(Ⅵ)}. The molar absorptivity of the complex is 1.22×105 L·mol-1· cm-1 at 600nm. Beer’s law is obeyed in the range of 0～20 ?g/10mL. The uranium in samples can be enriched and separated by solid phase extraction with TBP resin cartridge. This method was applied to the determination of uranium in water sample. The relative standard deviations are 1.8%～3.1%. The standard recoveries are 94%~104%. The results are satisfactory.
Key words 2-[2-(4-Methylquinolyl)-azo]-5-diethylaminophenol, Uranium, Spectrophotometry, Solid phase extraction

　

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环境水样中铀的研究

胡秋芬1,2 黄章杰2 李海涛1 杨光宇2 尹家元2
(1玉溪师范学院化学系 玉溪 653100 2云南大学化学系 昆明 650091)

摘 要 研究了2-[2-(4-甲基喹啉)-偶氮]-5-二乙氨基苯酚(QADP)与铀的显色反应，在pH为7.8的三乙醇胺-盐酸缓冲介质中，TritonX-100和氟离子存在下，QADP与铀(Ⅵ)、氟离子反应生成1/1/1的紫色三元稳定络合物，络合物的?max＝600nm，?＝1.22×105 L·mol-1·cm-1，铀含量在0～20?g/10mL内符合比尔定律，环境水样中的铀用TBP萃淋树脂固相萃取柱分离和富集后用该方法测定，方法相对标准偏在1.8%～3.1%之间，标准回收率在94%～104%之间，结果令人满意。
关键词 2-[2-(4-甲基喹啉)-偶氮]-5-二乙氨基苯酚 铀 光度法 固相萃取

胡秋芬 女，30岁，副教授，主要从事环境分析化学教学研究工作。
云南省教育厅科研基金资助项目(0237582)
2003-10-08收稿，2004-02-21接受

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