| Xie Yuhan,Yin Liangliang,Qian Yuxin,Xia Tingting,Ji Yanqin.Evaluation of influencing factors and uncertainty of detection of trace uranium in drinking water using ultraviolet fluorescence[J].Chinese Journal of Radiological Medicine and Protection,2022,42(4):291-296 |
| Evaluation of influencing factors and uncertainty of detection of trace uranium in drinking water using ultraviolet fluorescence |
| Received:July 09, 2021 |
| DOI：10.3760/cma.j.cn112271-20210709-00270 |
| KeyWords:Uranium|Ultraviolet Fluorescence|Uncertainty|Drinking water |
| FundProject:国家重点基础研究发展计划（2019YFC1604804） |
| Author Name | Affiliation | E-mail | | Xie Yuhan | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Yin Liangliang | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Qian Yuxin | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Xia Tingting | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | | Ji Yanqin | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | jiyanqin@nirp.chinacdc.cn |
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| Abstract:: |
| Objective To achieve rapid and accurate detection of trace uranium in drinking water by analyzing the factors influencing the accuracy of uranium measurement in drinking water using ultraviolet fluorescence method and by evaluating the uncertainty in measurement.Methods The influence of acidity, Fe3+ and Mn2+ contents on the analitical result were studied to optimize the measurement conditions. The accuracy of the measurement method was verified in 7 laboratories. By studying the errors introduced in the process of standard preparation, sample pretreatment and measurement, the sources of uncertainty were analyzed and the uncertainty was synthesized.Results At pH 1-11 in aqueous solution, the linear regression coefficient of the standard curve was greater than 0.995, which was in line with the linear measurement range of the instrument. At pH 12 or so, the linear regression coefficient was 0.761, which could not meet the measurement requirements. At pH<3 or pH>10, the increase in fluorescence count was lower, which might increase the measurement error. At Fe3+ concentration ≥ 15mg/L, a large deviation occurred in measurement value that could affect seriously measurement result. At Mn2+ concentration ≥ 1.6mg/L, the sample produced white precipitation, which could affect the measurement accuracy. Three spiked water samples with different concentrations were determined in 8 laboratories. Each water sample was measured six times in parallel. The relative standard uncertainty of the result were 6.42×10-2, 4.48×10-2 and 5.26×10-2 μg/L, and the expanded uncertainties were 0.03, 0.06 and 0.12 μg/L(k=2), respectively.Conclusions The optimum conditions for the determination of uranium in water using this method pH were in samples 3-10, the concentration of Fe3+ less than 15 mg/L, and the concentration of Mn2+ less than or equal to 1.6 mg/L. The main sources of uncertainty in the measurement of uranium in water using ultraviolet fluorescence method arise from the repeated measurement error and the volume of added standard solution. |
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