Perfluoroalkyl acids (PFAAs) in the aquatic food web of a temperate urban lake in East China: Bioaccumulation, biomagnification, and probabilistic human health risk

• Published in: Environmental pollution (1987) 2022-03, Vol.296, p.118748-118748, Article 118748
• Main Authors: Chu, Kejian, Lu, Ying, Hua, Zulin, Liu, Yuanyuan, Ma, Yixin, Gu, Li, Gao, Chang, Yu, Liang, Wang, Yifan
• Format: Article
• Language: English
• Subjects: Alkanesulfonic Acids - analysis; Animals; Bioaccumulation; Biomagnification; China; Ecosystem; Environmental Monitoring; Fluorocarbons - analysis; Food Chain; Human health risk; Humans; Lakes; Perfluoroalkyl acids; Temperate urban lake; Water Pollutants, Chemical - analysis
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2021.118748

The bioaccumulation and biomagnification of perfluoroalkyl acids (PFAAs) in temperate urban lacustrine ecosystems is poorly understood. We investigated the occurrence and trophic transfer of and probabilistic health risk from 15 PFAAs in the food web of Luoma Lake, a temperate urban lake in East China. The target PFAAs were widely distributed in the water (∑PFAA: 77.09 ± 9.07 ng/L), suspended particulate matter (SPM) (∑PFAA: 284.07 ± 118.05 ng/g dw), and sediment samples (∑PFAA: 67.77 ± 17.96 ng/g dw) and occurred in all biotic samples (∑PFAA: 443.27 ± 124.89 ng/g dw for aquatic plants; 294.99 ± 90.82 for aquatic animals). PFBA was predominant in water and SPM, with 40.11% and 21.35% of the total PFAAs, respectively, while PFOS was the most abundant in sediments (14.11% of the total PFAAs) and organisms (14.33% of the total PFAAs). Sediment exposure may be the major route of biological uptake of PFAAs. The PFAA accumulation capacity was the highest in submerged plants, followed by emergent plants > bivalves > crustaceans > fish > floating plants. Long-chain PFAAs were biomagnified, and short-chain PFAAs were biodiluted across the entire lacustrine food web. PFOS exhibited the greatest bioaccumulation and biomagnification potential among the target PFAAs. However, biomagnification of short-chain PFAAs was also observed within the low trophic-level part of the food web. Human health risk assessment indicated that perfluorooctanesulfonate (PFOS) and perfluorooctanoic acid (PFOA) posed health risks to all age groups, while the other PFAAs were unlikely to cause immediate harm to consumers in the region. This study fills a gap in the knowledge of the transfer of PFAAs in the food webs of temperate urban lakes. [Display omitted] •We studied the biotransfer of PFAAs in the food web of a temperate urban lake.•Sediment exposure was the major source of ingested PFAAs for organisms.•Long-chain PFAAs were biomagnified; short-chain PFAAs were diluted in the food web.•PFOS exhibited the greatest bioaccumulation and biomagnification potential.•PFOS and PFOA in aquatic products posed health risks to 2–6-year-old children.