关键词: 邻苯二甲酸酯;分布特征;季节变化;健康风险评价;饮用水水源地;东风水库;飞井海水库

Abstract: To explore the seasonal variation features and health risk status of phthalates esters(PAEs) in lake-reservoir type drinking water sources, the drinking water bodies of Dongfeng Reservoir and Feijinghai Reservoir in Yuxi City were selected as research regions.Based on the monthly water quality monitoring data provided by the local ecological and environmental monitoring department in the period 2021 to 2023,the mass concentration levels, seasonal various and distribution characteristics of PAEs in study waters were analyzed, and health risk assessments for adults and children were carried out.The findings revealed that:(1) From 2021 to 2023,dibutyl phthalate(DBP) and di-2-ethylhexyl phthalate(DEHP) had a high detection rate( ≥ 94.4 %) in studied water bodies.The mean and maximum mass concentrations of DBP were 0.48 μg/L and 2.91 μg/L,the mean and maximum mass concentrations of DEHP were 1.12 μg/L and 3.94 μg/L,respectively, they are within the standards for drinking water quality(GB 5749-2022) and environmental quality standard for surface water(GB 3838-2002).(2) In the study, the monthly average mass concentrations of DBP and DEHP had significant seasonal differences.The mass concentration levels of DBP and DEHP were consistent with the same pattern of seasonal change, which were higher in summer and autumn than that in spring and winter.For different water periods, the mass concentrations of DBP and DEHP were greater in the abundant water period than the dry and normal water period, and the monthly average mass concentration of DEHP in studied water bodies was generally higher than DBP in the same period.(3) Through drinking water and skin infiltration, the maximum non-carcinogenic health risk of DBP to adults and children was at the 10-3level, which presented no risk.However, the maximum carcinogenic health risk of DEHP to adults and children reached 1.57×10-6and 2.07×10-6,which is a potential carcinogenic health risk and should be taken seriously.Drinking pathway is the main exposure route for both carcinogenic and non-carcinogenic health risks, and it is recommended to focus on the carcinogenic risks arising from it for both adults and children.

Key words: phthalates esters ; distribution characteristics ; seasonal variation ; health risk assessment ; drinking water sources area ; Dongfeng Reservoir ; Feijinghai Reservoir