城市水环境PFAAs前驱体污染特征及健康风险

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Abstract In order to characterize the input, distribution and health risk of precursors of perfluoroalkyl acids (PFAAs) in the urban aquatic environment, the effluents of wastewater treatment plants, rivers, lakes and drinking water sources in the Yangtze River in Nanjing were investigated. HPLC-MS/MS and the total oxidizable precursor assay (TOP Assay) were used to analyze 17PFAAs and their total oxidizable precursors. Their health risk quotient (HQ) was assessed based on the tolerable dose interpretation. The results suggested in the effluents PFAAs concentration was 90.6~278ng/L, and the dominant homologues PFBS, PFHxA, PFOA accounted for 63%. The total oxidizable precursors concentration was 239~839pmol/L, and PFBA predominated among the precursors. PFAAs concentration in urban surface water was 61.8~157ng/L, and the concentration of total oxidizable precursors was 195~572pmol/L. PFBA, PFPeA and PFHxA displayed the highest concentration of precursors. PFAAs level in the urban rivers increased while oxidizable precursors level decreased. PFAAs concentration in drinking water sources was 50.9~54.6ng/L, and the total oxidizable precursors concentration was 273~372pmol/L, predominated by the precursor of PFBA, PFPeA and PFHxA. The relatively high risk was immunotoxicity from PFOS (HQ=0.024) and developmental toxicity (HQ=0.0073) and reproductive toxicity (HQ=0.0039) from PFOA. Transformation of oxidizable precursors could increase their potential risk by 23% and 40%. The widespread presence of precursors in aquatic environments may increase the environmental exposure and health risks of PFAAs.

Key words： perfluoroalkyl substances perfluoroalkyl acids precursor urban water pollution emerging pollutants

Received: 24 May 2022

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X592

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	ZHANG Yue-qing
	ZHAO Ya-xin
	YU Jia
	CAO Li
	KONG De-yang

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ZHANG Yue-qing,ZHAO Ya-xin,YU Jia等. Contamination and health risk of precursors of PFAAs in urban aquatic environment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5896-5904.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5896

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