Bioaccumulation behavior and spatiotemporal trends of per- and polyfluoroalkyl substances in Indo-Pacific humpback dolphins from the Pearl River Estuary, China.
作者： Duan Gui , Mei Zhang , Tao Zhang , Bo Zhang , Wenzhi Lin
DOI: 10.1016/J.SCITOTENV.2018.12.278
关键词:
摘要: Abstract Sixteen per- and polyfluoroalkyl substances (PFASs) were measured in liver (n = 52) kidney (n = 18) tissues of Indo-Pacific humpback dolphins (Sousa chinensis) stranded the Pearl River Estuary (PRE) China between 2004 2016. The average concentrations perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) most other PFASs samples respectively greater than any records previously reported cetaceans globally. PFOS levels 46% dolphin exceeded hepatic toxicity threshold cetaceans. For first time, we found a U-shaped trend for distribution pattern perfluorinated carboxylic acids (PFCAs) with increasing carbon chain lengths (C5-C16), whereas descending (C4-C10) was perfluoroalkane sulfonic (PFASs), which may be explained by binding efficiencies PFAS analogues to proteins. Dolphins highest ∑PFASs (age-corrected) clustered near river outlets Lingdingyang area, agrees spatial environment. Significant temporal trends observed many PFASs. Concentrations PFOA, perfluorononanoic (PFNA), perfluorodecanoic (PFDA) perfluoroheptanoic (PFHpA) all peaked year 2011, followed decreasing trend, while consistently shown perfluoroundecanoic (PFUdA) perfluorodecane (PFDS). Our findings contribute knowledge tissue spatiotemporal PRE dolphins, are valuable us understand exposure risk their industrial emission Southern China.
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