Occurrence and risk assessment of total mercury and methylmercury in surface seawater and sediments from the Jiaozhou Bay, Yellow Sea

被引：28

作者：

Mao, Lulu ^{[1
]}

Liu, Xitao ^{[1
]}

Wang, Baodong ^{[2
]}

Lin, Chunye ^{[1
]}

Xin, Ming ^{[2
]}

Zhang, Bo-Tao ^{[3
]}

Wu, Tingting ^{[1
]}

He, Mengchang ^{[1
]}

Ouyang, Wei ^{[1
]}

机构：

[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, Beijing 100875, Peoples R China

[2] Minist Nat Resources, Inst Oceanog 1, Qingdao 266061, Peoples R China

[3] Beijing Univ, Coll Water Sci, Beijing 100875, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2020年 / 714卷

基金：

中国国家自然科学基金;

关键词：

Spatial distribution; Human activity; Natural process; ATMOSPHERIC MERCURY; METHYL MERCURY; WATER COLUMN; CONTINENTAL-SHELF; ORGANIC-MATTER; CHESAPEAKE BAY; RIVER ESTUARY; COASTAL; SPECIATION; CHINA;

D O I：

10.1016/j.scitotenv.2020.136539

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The Jiaozhou Bay is a semi-endosed bay located in the middle of the Yellow Sea. Effluents from wastewater treatment plants have been carried into the bay, which has significantly increased the deposition of mercury. The spatial distributions of total mercury (THg) and methylmercury (MeHg) in dissolved state, in suspended matters of seawater and surface sediments at 26 locations inside the Jiaozhou Bay and five surrounding rivers in April 2018 were examined. The contents ofTHg and MeHg found along the eastern coast were higher than those found along the western coast, which indicated the impact of human activities (river input) on the Jiaozhou Bay. The partition coefficient (LogKd) was used to express the distribution relationships of THg and MeHg in suspended matters and dissolved state, and it was concluded that suspended matter was the main reservoir of mercury in Jiaozhou Bay seawater. The correlations between contents and physicochemical properties of seawater showed that THg and MeHg concentrations in seawater decreased with increasing salinity and pH. The effects of the mean grain diameter (MGD) and sediment organic matter (SOM) on the THg and MeHg in surface sediments were also discussed. Principal component analysis (PCA) was used to obtain the factors determining the methylation proportion in the surface sediments, indicating that the combination of human activities and natural processes affected the degree of methylation in the sediments. The spatial distribution of THg, MeHg and MeHg% was suggested to be disturbed by the interaction of natural processes and human activities (river input) by the correlation analysis of the corresponding pollutant concentrations among seawater and. Although the concentrations of THg and MeHg in seawater and sediments of the Jiaozhou Bay did not exceed the Chinese regulatory standards, the pollution levels of THg and MeHg were comparable to those in other bays in the world. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：13

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