Analysis of uranium concentration in surface water and drinking water in Beijing,China
Objective To explore the uranium concentration in surface water and drinking water in Beijing,China and the relationship between uranium concentration and gross α activity concentration.Methods Water samples were collected from 16 districts in Beijing.Uranium concentration and gross α activity concentration were measured with WGJ-Ⅲ trace uranium analyzer and LB6008 six-channel α/β counter using the ultraviolet fluorescence and thick source methods.Results The uranium concentrations in surface water and drinking water were 1.131 and 1.572 μg/L,respectively.The gross α activity concentrations in surface water and drinking water were 0.059 and 0.074 Bq/L,respectively.There were no significant differences in uranium concentration and gross α activity concentration between surface water and drinking water(P＞0.05).The uranium concentration was positively correlated with the gross α activity concentration,with a correlation coefficient of 0.700(P＜0.05).The gross α activity concentration was determined by the uranium concentration with a de-termination coefficient of 48％.The committed effective dose of 238U in drinking water was between 3.284 x 10-5 and 1.640 x 10-3 mSv,with an average value of 5.400 × 10-4 mSv.Conclusion The uranium concentration and gross α activity in the surface water and drinking water in Beijing fluctuate and remain in the background range.These values are much lower than the recommended limits of 0.03 mg/L and 0.5 Bq/L stipulated in the GB 5749-2021 Standard for Drinking Water Quality.The annual committed effective dose of 238U through drinking water ingestion is very small.
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