黄河水下三角洲表层沉积物汞(Hg)分布特征及其影响因素

车新颖; 刘明; 王飞宇; 陈竟博; 孙学诗; 范德江

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2806-2815.

环境生态

黄河水下三角洲表层沉积物汞(Hg)分布特征及其影响因素

车新颖¹, 刘明^1,2, 王飞宇¹, 陈竟博¹, 孙学诗^1,2, 范德江^1,2

作者信息 +

Distribution characteristics and influencing factors of Mercury (Hg) in the surface sediment of Yellow River Subaqueous Delta

CHE Xin-ying¹, LIU Ming^1,2, WANG Fei-yu¹, CHEN Jing-bo¹, SUN Xue-shi^1,2, FAN De-jiang^1,2

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摘要

基于对黄河水下三角洲表层沉积物的物质组成和汞(Hg)含量的分析,以期了解黄河水下三角洲Hg分布特征及影响因素.结果表明,黄河水下三角洲表层沉积物中的Hg含量介于15.09~53.11μg/kg,平均含量为36.32μg/kg,相较于其他国内外海域较低.沉积物中Hg含量由岸向海呈现“低-高-低-高”的间隔分布,切变锋位置和外海细颗粒沉积区Hg含量出现峰值,南部靠近莱州湾区域沉积物中Hg含量也较高.Hg以自然来源为主,同时受人类活动排放的影响.水动力条件对沉积物中Hg的分布有显著的控制作用,Hg倾向于在细颗粒沉积物中富集,河口的“过滤器”效应尤其是切变锋的作用显著影响了Hg的空间分布和向远海的迁移.沉积物中Hg的分布还与有机碳、碳酸盐矿物和铁锰氧化物等其在沉积物中的赋存载体有关,一方面,这些赋存载体直接与Hg结合影响其在沉积物中的分布,另一方面这些赋存载体还会影响沉积物的性质进而间接影响Hg的分布.

Abstract

Based on the analysis of the material composition and mercury (Hg) content in the surface sediments of the Yellow River subaqueous delta, the distribution characteristics and influencing factors of Hg in the region were examined. The results showed that the Hg content in the surface sediments ranged from 15.09 to 53.11μg/kg, with an average content of 36.32μg/kg, which was relatively low compared to other domestic and international marine areas. The Hg content in the sediments exhibited a 'low-high-low-high' pattern from the shore to the sea, with peak concentrations observed at the shear front and in the fine-grained sediment areas offshore. Elevated Hg levels were also found in the sediments near Laizhou Bay in the southern region. Hg was primarily derived from natural sources but was also influenced by emissions from human activities. Hydrodynamic conditions played a crucial role in controlling the distribution of Hg, with a tendency for Hg to accumulate in fine-grained sediments. The 'filter' effect of the estuary, especially the shear front, significantly influenced the spatial distribution of Hg and its transport to the open sea. The distribution of Hg was also related to its carriers, such as organic carbon, carbonate minerals, and iron-manganese oxides. These carriers directly bound with Hg, affecting its distribution, and also influenced the properties of the sediments, thus indirectly influencing the distribution of Hg.

导出引用

车新颖, 刘明, 王飞宇, 陈竟博, 孙学诗, 范德江. 黄河水下三角洲表层沉积物汞(Hg)分布特征及其影响因素[J]. 中国环境科学. 2025, 45(5): 2806-2815

CHE Xin-ying, LIU Ming, WANG Fei-yu, CHEN Jing-bo, SUN Xue-shi, FAN De-jiang. Distribution characteristics and influencing factors of Mercury (Hg) in the surface sediment of Yellow River Subaqueous Delta[J]. China Environmental Science. 2025, 45(5): 2806-2815

中图分类号： X53

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