Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Max-Plank Street 1, 21502 Geesthacht, Germany; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Kehua Road 511, Guangzhou 510631, China; Yantai Institute of Coastal Zone Research, CAS, Chunhui Road 17, Yantai 264003, China.
Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Coastal Research, Max-Plank Street 1, 21502 Geesthacht, Germany.
Sci Total Environ. 2015 Apr 1;511:145-52. doi: 10.1016/j.scitotenv.2014.12.063. Epub 2014 Dec 23.
Perfluoroalkyl acids (PFAAs) have been determined in the environment globally. However, studies on the occurrence of PFAAs in marine sediment remain limited. In this study, 16 PFAAs are investigated in surface sediments from the German Bight, which provided a good overview of the spatial distribution. The concentrations of ΣPFAAs ranged from 0.056 to 7.4 ng/g dry weight. The highest concentration was found at the estuary of the River Ems, which might be the result of local discharge source. Perfluorooctane sulfonic acid (PFOS) was the dominant compound, and the enrichment of PFOS in sediment might be strongly related to the compound structure itself. The geographical condition of the German Bight influenced the movement of water and sediment, resulting in complex distribution. Following normalization according to total organic carbon (TOC) content, PFAA distributions showed a different picture. Significant linear relationships were found between total PFAA concentrations and TOC (R2=0.50, p<0.01). Compared with a previous study conducted in the same area, a declining trend was presented for the concentrations of PFOS and perfluorooctanoic acid (PFOA). Compound structure, geographical condition, and organic carbon in the sediment influence the distribution of PFAAs in the German Bight. Environmental risk assessment indicated that the risk from PFOA is negligible, whereas PFOS in marine sediment may present a risk for benthic organisms in the German Bight.
全氟烷基酸（PFAAs）在全球环境中均有检出。然而，有关海洋沉积物中 PFAAs 出现的研究仍然有限。本研究调查了德国北海的表层沉积物中 16 种 PFAAs，为该地区的 PFAAs 空间分布提供了全面的概述。ΣPFAAs 的浓度范围为 0.056 至 7.4ng/g 干重。在埃姆斯河河口处发现的浓度最高，这可能是当地排放源的结果。全氟辛烷磺酸（PFOS）是主要的化合物，PFOS 在沉积物中的富集可能与化合物结构本身密切相关。德国北海的地理位置影响了水和沉积物的流动，导致了复杂的分布情况。根据总有机碳（TOC）含量进行归一化后，PFAA 的分布呈现出不同的情况。总 PFAA 浓度与 TOC 之间存在显著的线性关系（R2=0.50，p<0.01）。与同一地区之前进行的研究相比，PFOS 和全氟辛酸（PFOA）的浓度呈现出下降的趋势。化合物结构、地理位置和沉积物中的有机碳均会影响德国北海 PFAAs 的分布。环境风险评估表明，PFOA 的风险可以忽略不计，而海洋沉积物中的 PFOS 可能对德国北海的底栖生物构成风险。
