Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration & Second Institute of Oceanography, Ministry of Natural Resources, Baochubei Road 36, Hangzhou 310012, PR China.
Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration & Second Institute of Oceanography, Ministry of Natural Resources, Baochubei Road 36, Hangzhou 310012, PR China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Baochubei Road 36, Hangzhou 310012, PR China.
Sci Total Environ. 2020 Feb 10;703:134763. doi: 10.1016/j.scitotenv.2019.134763. Epub 2019 Nov 5.
A total of 29 sediment samples were collected from the East China Sea (ECS), with the Yangtze River estuary and the Zhejiang costal area. These sediment samples were analyzed for 6 phthalate esters (PAEs) and 16 polycyclic aromatic hydrocarbons (PAHs): the ΣPAEs and ΣPAHs concentrations ranged between 1649.5 and 8451.5 ng g (mean = 3446.3 ng g) and 57.5-364.5 ng g (mean = 166.2 ng g), respectively. Overall, the PAEs and PAHs concentrations gradually decreasing in the offshore and southward directions: their compositions and distributions suggest they could have mainly derived from the Yangtze River. In particular, their distribution was influenced by the sources' proximity, hydrodynamics, and sediment geochemistry (i.e., TOC content and grain size). A classical two-end member model was utilized to estimate the fraction of terrestrial organic carbon in the sediments of the ECS. When the sediment was dominated by terrestrial-derived organic matter (OM), the concentrations of PAEs and PAHs were significantly correlated to the TOC content and gran size of the sediments. In contrast, the poor correlation of TOC content and grain size with PAEs in those sediments dominated by marine-derived OM, implied that the distribution of PAEs in the ECS was mainly related to land-based inputs, (especially to that of the Yangtze River). Regardless of the origin of most of the OM contained in the sediments, we observed positive correlations between the TOC content, and grain size of those containing PAHs. These results suggest that the distribution of PAHs in the ECS was not only related to the Yangtze River input, but also to the geochemical characteristics of the sediments.
共采集了 29 个来自东海（ECS）的沉积物样品，包括长江口和浙江沿岸地区。对这些沉积物样品进行了 6 种邻苯二甲酸酯（PAEs）和 16 种多环芳烃（PAHs）的分析：ΣPAEs 和 ΣPAHs 浓度范围分别为 1649.5 至 8451.5ng/g（平均值为 3446.3ng/g）和 57.5 至 364.5ng/g（平均值为 166.2ng/g）。总体而言，PAEs 和 PAHs 的浓度沿离岸和向南方向逐渐降低：它们的组成和分布表明，它们主要来源于长江。特别是，它们的分布受到源的接近度、水动力和沉积物地球化学（即 TOC 含量和粒度）的影响。利用经典的双端元模型来估算东海沉积物中陆源有机碳的比例。当沉积物主要由陆源有机质（OM）组成时，PAEs 和 PAHs 的浓度与沉积物的 TOC 含量和粒度呈显著相关。相比之下，在那些以海洋源 OM 为主的沉积物中，TOC 含量和粒度与 PAEs 之间的相关性较差，这表明 PAEs 在东海的分布主要与陆源输入有关（尤其是与长江有关）。无论沉积物中 OM 的来源如何，我们都观察到 TOC 含量和含有 PAHs 的沉积物粒度之间存在正相关关系。这些结果表明，PAHs 在东海的分布不仅与长江输入有关，还与沉积物的地球化学特征有关。
