【摘要】 研究了2-(2-喹啉偶氮)-4-甲基-1,3-二羟基苯(QAMDHB)与铀的显色反应。在pH 7.8三乙醇胺-盐酸缓冲介质中,Triton X-100和氟离子存在下,QAMDHB与铀(Ⅵ)、氟离子反应生成1∶1∶1紫色三元稳定络合物,络合物的λmax=562 nm,ε=8.0×104L.mol-1.cm-1,铀含量在0~20μg/10 mL内符合比耳定律。环境水样中的铀用TBP萃淋树脂固相萃取柱分离和富集后测定,方法的相对标准偏差在1.8%~2.4%之间,标准回收率在97%~104%。更多还原

【Abstract】 In a TEA-HCl buffer medium of pH 7.8,and in the presence of Triton X-100,a stable violet colored ternary complex was formed among U（Ⅵ）,QAMDHB and F^——ion in the mole ratio of 1∶1∶1.The absorption maxima of the complex was found at the wavelength of 562 nm,where the molar absorptivity of the color system was found to be 8.0×10⁴L·mol^-1·cm^-1.Beer′s law was kept in the concentration range of 0-20 μg of U（Ⅵ） per 10 mL of solution.The method has been applied to the analysis of environmental water sample after an enrichment of the uranium by solid-phase extraction through a TBP elution resin solid-phase extraction column（（7 mm×30 mm,30 μm）.） The acidity of the sample solution for solid-phase extraction was chosen as 5 mol·L^-1 HNO₃,water was used as eluant and the elution was carried out in the reverse direction.The RSD′s obtained were in the range from 1.8%-2.4%,and the recoveries were in the range of 97%-104%.更多还原