School of Earth Sciences, Zhejiang University, Hangzhou 310027, China; Hainan Institute of Zhejiang University, Sanya 572000, China.
South China University of Technology, Guangzhou 511442, China.
Mar Pollut Bull. 2023 Aug;193:115082. doi: 10.1016/j.marpolbul.2023.115082. Epub 2023 Jun 21.
Huge amount of trace metals emitted through manmade activities are carried by the Changjiang River into the East China Sea. Most of them deposit in the Changjiang River Estuary and threaten the regional aquatic environment. In this study, major and trace elements of 34 archive surface sediments and two cores are examined. Sequential extraction procedures were also performed on surface sediments from 12 sites. We found that Tl, Tm, Er show distinct accumulation in surface sediments in the order of Tm > Tl > Er. Particularly, abnormally elevated HREE are observed mainly in those sites near the mouth of the estuary. Most elements exhibit an obvious reduction in the upper 30 cm of core B8, reflecting a decrease of sediment discharge from Changjiang River runoff. The increase of some trace elements recorded in the upper 20 cm of core C3 demonstrates a distinct local anthropogenic input in recent years.
大量通过人为活动排放的痕量金属通过长江输送到东海。它们中的大部分沉积在长江口，威胁着区域水生环境。本研究对 34 个档案表层沉积物和两个岩芯中的常量和微量元素进行了检测。还对来自 12 个站点的表层沉积物进行了连续提取程序。我们发现 Tl、Tm、Er 在表层沉积物中表现出明显的积累，顺序为 Tm>Tl>Er。特别是，在河口附近的那些站点，观察到异常高的 HREE。大多数元素在 B8 岩芯的上 30 厘米处明显减少，反映出长江径流量减少导致的沉积物排放量减少。C3 岩芯上 20 厘米处记录的一些痕量元素的增加表明近年来存在明显的本地人为输入。
