Pollution levels and health risk assessment of perchlorate in drinking water in the Minjiang and Jialing River Basins
Objective To analyze the pollution level of Perchlorate in drinking water in the basin and coastal areas of Minjiang river and Jialing river,and to assess its health risks,and to provide reference data for the safety limit of drinking water in the basin areas.Methods In 2022,on-site sampling was conducted at 21 monitoring points near the main stream of Minjiang and Jialing River,total of 126 drinking water samples were collected,and the perchlorate content in drinking water was detected by ultra high performance liquid chromatography tandem mass spectrometry method.The concentration change and spatial distribution of perchlorate in different types of water were analyzed by SPSS 17.0.Single factor analysis of variance and Fisher multiple variance comparison were used to compare the concentration of that.Perchlorate in different water stages was compared by paired t-test,and perchlorate in different basins was compared by Mann-Whitney U test,the test level α=0.05.By using the US Environmental Protection Agency's(US EPA)health risk model to assess human health risks.Results Total 126 water samples were all detected for perchlorate,with a detection rate of 100％and a maximum value of 15.60 μg/L,median 2.80 μg/L.There difference in Perchlorate concentration in water periods and watersheds was considered statistically significant(all P＜0.05).The concentration distribution of perchlorate in the water sample showed that the Minjiang river was higher than that of Jialing river,and the overall upstream was higher.The non carcinogenic risk values of Perchlorate intake through drinking water were less than 1.Conclusions The perchlorate detection values of drinking water monitoring points in the Minjiang and Jialing Rivers in 2022 did not exceed the national standard limits.The non carcinogenic risk of Perchlorate in drinking water in the basins of Minjiang and Jialing Rivers is acceptable.Attention should be paid to the concentration distribution of perchlorate to ensure the safety of drinking water in the basin.
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NSTL
万方数据
