School of Marine Engineering and Technology, Sun Yat-sen University (Guangzhou)/Southern Laboratory of Ocean Science and Engineering, Zhuhai, China; Institute of Estuarine and Coastal Research, Guangdong Provincial Engineering Research Center of Coasts, Islands and Reefs, Guangzhou, China.
School of Geography and Planning, Sun Yat-sen University, Guangzhou, China.
Environ Pollut. 2021 Dec 1;290:118126. doi: 10.1016/j.envpol.2021.118126. Epub 2021 Sep 7.
Sediment samples were collected to clarify the effect of changing sedimentary environment under long-term reclamation on heavy metals (Cr, Zn, Pb, Cu, Cd, and Ni) in a partially mixed estuary (Modaomen) of the Pearl River Delta. The ecological toxicity and source apportionment of these metals were discussed as well. The metal species during the 2010s (as 2015, 2018) was more enriched than that during the 2000s (as 2003) and 1990s (as 1991). This estuary overall suffered from a "moderate-to-high" pollution status. The element Cd was a major concern for the ecosystem's health because of its high toxicity. Sediment quality guidelines suggested that adverse biological effects were likely to be caused by Cu and Cd in the early adjustment stage, while the threats to marine organisms caused by the elements of Cu, Cr, Zn, and Ni were elevated during the 2010s. Two receptor models of PCA-MLR and PMF quantified the source types and contributions of these heavy metals. Strong intensity of industrial activities coupling with agricultural applications and import of adjacent seas were responsible for the enriched accumulation of heavy metals in sediments. Metal source apportionment would help to control the metal input into the estuary; identifying the role of sedimentary environment on heavy metals can inform the sediment quality management in the estuary.
采集沉积物样品，以阐明长期围垦下沉积环境变化对珠江三角洲部分混合河口（磨刀门）重金属（Cr、Zn、Pb、Cu、Cd 和 Ni）的影响。还讨论了这些金属的生态毒性和来源分配。2010 年代（如 2015 年、2018 年）的金属种类比 2000 年代（如 2003 年）和 1990 年代（如 1991 年）更为丰富。总体而言，该河口处于“中-高”污染状态。由于 Cd 的高毒性，它是生态系统健康的主要关注点。沉积物质量准则表明，Cu 和 Cd 可能在早期调整阶段对生物产生不利影响，而 Cu、Cr、Zn 和 Ni 等元素在 2010 年代对海洋生物的威胁增加。主成分分析-多元线性回归（PCA-MLR）和潜在因子分析-多元线性回归（PMF）两种受体模型量化了这些重金属的源类型和贡献。工业活动与农业应用的强烈耦合以及相邻海域的输入是重金属在沉积物中富集积累的原因。金属源分配有助于控制金属输入河口；确定沉积环境对重金属的作用可以为河口的沉积物质量管理提供信息。
