Anthropogenic influences on the sources and distribution of organic carbon, black carbon, and heavy metals in Daya Bay's surface sediments.
Anthropogenic influences on the sources and distribution of organic carbon, black carbon, and heavy metals in Daya Bay's surface sediments.
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DOI：
10.1016/j.marpolbul.2023.115571
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发表时间：
2023-09
影响因子：
5.8
通讯作者：
Yin Yang;Yilan Li;Chao Huang;Fajin Chen;Chunqing Chen;Huiling Zhang;Wenfeng Deng;Feng Ye
中科院分区：
文献类型：
--
作者：
Yin Yang;Yilan Li;Chao Huang;Fajin Chen;Chunqing Chen;Huiling Zhang;Wenfeng Deng;Feng Ye
通过测定大亚湾表层沉积物的总有机碳（TOC）、总氮（TN）、黑碳（BC）、δ13CTOC、δ15N、δ13CBC、粒度和重金属等参数的空间分布特征，探讨人类活动对表层沉积物的影响。海相有机质平均约占沉积物的84.41±7.70%。大亚湾西部和北部沉积物粒度较细，水动力条件弱，沉积速率高，有利于有机质的埋藏和保存。高浓度的有机物可归因于石油和水产养殖业的影响。化石燃料是BC的主要来源。利用富集因子（EF）和地积累指数（Igeo）评价重金属来源和污染程度。结果表明：大亚湾大部分地区重金属来源和分布受人类活动影响较大，污染程度为中等。重金属的igo值与BC、TOC、TN和平均颗粒粒径（Mz）有较强的相关性。这表明大亚湾沉积物富集和吸附重金属的能力取决于沉积物粒度、有机质含量和类型。重要的是，大亚湾内湾沉积物比外湾沉积物具有更强的阻止重金属迁移的能力。
The total organic carbon (TOC), total nitrogen (TN), black carbon (BC), δ13CTOC, δ15N, δ13CBC, grain size, and heavy metals of surface sediments collected from Daya Bay were determined to investigate the spatial distributions of these parameters and to evaluate the influences of human activities. Marine organic matter was found to constitute approximately 84.41 ± 7.70 % of these sediments on average. The western and northern regions of Daya Bay exhibited relatively fine grain sizes, weak hydrodynamic conditions, and high sedimentation rates, which favored the burial and preservation of organic matter. The high concentration of organic matter could be attributed to the influence of petroleum and aquaculture industries. Fossil fuels were the main source of BC. The enrichment factor (EF) and geo-accumulation index (Igeo) were used to evaluate the sources and pollution levels of heavy metals. The results revealed that the source and distribution of heavy metals were strongly influenced by human activities, resulting in moderate pollution levels across most regions of Daya Bay. A strong correlation was observed between the Igeovalues of heavy metals and BC, TOC, TN, and mean particle grain size (Mz). This suggests that the ability of sediments in Daya Bay to enrich and adsorb heavy metals depends on the sediment grain size, the content and type of organic matter. Importantly, sediments in the inner bay of Daya Bay exhibited a greater capacity to impede the migration of heavy metals compared to those in the outer bay.