Abstract：During the direct determination of uranium in high-hardness groundwater by ultraviolet impulse fluorescence method which was recommended by national standard (GB/T 6768—986), the solution would be turbid after adding fluorescence intensifier of uranium and the determination was hardly conducted. However, this phenomenon was not observed for the determination of normal low-hardness water samples. The cause of this phenomenon was analyzed in this study. The results showed that the calcium ion (the content of calcium ion in high-hardness groundwater was usually high) could react with phosphates in fluorescence intensifier of uranium to form calcium phosphate precipitate, which was the root cause to result in turbidity. Although magnesium ion could also react with phosphate, the reaction did not occur under the selection conditions of national standard method. Therefore, it had no influence on the determination of uranium. In this study, proper amount of ethylene glycol-bis-(2-aminoether) acetate tetrahydrate (EGTA) was added into testing water sample for the complexation with calcium ion, avoiding the turbid phenomenon of solution after adding fluorescence intensifier of uranium. The determination method of uranium in high-hardness groundwater by ultraviolet impulse fluorescence was established. Under the optimized experimental conditions, the detection limit of method was 0.02 μg/L. The ultraviolet impulse fluorescence method was applied to the determination of actual high-hardness groundwater samples. The found results were basically consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The relative standard deviations (RSD, n=11) were less than 5%. The recoveries of standard addition were between 99.5% and 101%.
付琳, 王哲, 王玉学. 紫外脉冲荧光法测定高硬度地下水中铀[J]. 冶金分析, 2016, 36(8): 65-68.
FU Lin, WANG Zhe, WANG Yu-xue. Determination of uranium in high-hardness groundwater by ultraviolet impulse fluorescence method. , 2016, 36(8): 65-68.
辛至秀.运用放射性水化学方法寻找隐伏铀矿体[J].世界核地质科学,2012,29(2):93-98.XIN Zhi-xiu.The exploration of buried uranium ore bodies by hydrochemical radioactive method[J].World Nuclear Geoscience,2012.29(2):93-98.
[5]
马生凤,温宏利,许俊玉,等.电感耦合等离子体质谱法测定地下水中44个元素[J].岩矿测试,2010,29(5):552-555.MA Sheng-feng,WEN Hong-li,XU Jun-yu,et al.Determination of 44 elements in groundwater by inductively coupled plasma-mass spectrometry[J].Rock And Mineral Anylysis,2010.29(5):552-555.
王雪,王玉学,李红光,等.紫外脉冲荧光法测定锆英砂中铀含量[J].冶金分析,2014.34(5):60-63.WANG Xue,WANG Yu-xue,LI Hong-guang,et al.Determination of uranium in zircon sand by ultraviolet pulse-induced fluorescence method[J].Metallurgical Analysis,2014,34(5):60-63.
[8]
刘立坤,郭冬发,李斌凯,等.紫外脉冲荧光法测定盐湖水中铀质量浓度[J].铀矿地质,2011,27(3):180-184.LIU Li-kun,GUO Dong-fa,LI Bin-kai,et al.Determination of trace uranium in salt lake water by ultraviolet pulse light induced fluorometry[J].Uranium Geology,2011,27(3):180-184.
[9]
徐永源,邱孙泰.铀荧光增强剂YZ-Ⅰ和YZ-Ⅱ及其在激光荧光法测定痕量铀中的应用[J].核化学与放射化学,1983,5(2):39-44.XU Yong-yuan,QIU Sun-tai.The fluorescence-enhancing agents YZ-Ⅰand YZ-Ⅱ of uranium and their uses in the laser fluorimetric determination of trace uranium[J].Journal of Nuclear and Radiochemistry,1983,5(2):39-44.
