Arsenic speciation in aquifer sediment under varying groundwater regime and redox conditions at Jianghan Plain of Central China

Duan, Yanhua1; Gan, Yiqun1,2; Wang, Yanxin1,2; Liu, Chongxuan3; Yu, Kai1; Deng, Yamin4; Zhao, Ke1; Dong, Chuangju4

2017-12-31

10.1016/j.scitotenv.2017.07.011

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

At Jianghan Plain of central Yangtze basins where the health of >73, 000 people has been affected by long term intake of high arsenic groundwater, over 100 sediment samples from four boreholes at the field monitoring sites were collected and analyzed to delineate the distribution and speciation of As in the shallow aquifer sediment. Results showed that sediment As concentration is generally dependent on the lithological conditions, with the higher As concentration present in fine particle sediment, especially in the silty sand layers underlying clay or silty clay layers. High As concentration in the sediment mainly occurred in three different depth ranges: <5 m, 15-35 m, and >35 m. Both the groundwater regime and redox conditions played important roles in controlling sediment As speciation. Arsenate (86%) was the dominated As species in the near surface sediment. As the redox turned to be reducing, arsenite (64%) became the dominant species in the underlying clay and silty clay layers. But in the silty sand aquifer near the boundary of unconfined aquifer and confined aquifer, arsenate (85%) became the dominant species again as results of redox potential elevation. In the deep medium to coarse sand aquifers (>35m deep), As-sulfides (49%-63%) were the main species of As. The speciation and reactivity of sediment As strongly controlled the spatial distribution of groundwater As concentration, while seasonal variation in groundwater As concentration and speciation affected the content and speciation of sediment As. (C) 2017 Elsevier B.V. All rights reserved.

Arsenic pollution Redox controls Speciation Mobility Central Yangtze basins

SCI ; EI

英语

其他

South University of Science and Technology[GG01296001]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000408755300099

ELSEVIER SCIENCE BV

20172903952126

Aquifers ; Carrier mobility ; Hydrogeology ; Lithology ; Redox reactions ; Sand ; Sediments ; Sulfur compounds

Groundwater:444.2 ; Geology:481.1 ; Soil Mechanics and Foundations:483 ; Soils and Soil Mechanics:483.1 ; Semiconducting Materials:712.1 ; Chemical Reactions:802.2

ENVIRONMENT/ECOLOGY

Web of Science

1.China Univ Geosci, Sch Environm Studies, Wuhan 430074, Hubei, Peoples R China
2.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
4.China Univ Geosci, Geol Survey, Wuhan 430074, Hubei, Peoples R China

Duan, Yanhua,Gan, Yiqun,Wang, Yanxin,et al. Arsenic speciation in aquifer sediment under varying groundwater regime and redox conditions at Jianghan Plain of Central China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2017,607:992-1000.

Duan, Yanhua.,Gan, Yiqun.,Wang, Yanxin.,Liu, Chongxuan.,Yu, Kai.,...&Dong, Chuangju.(2017).Arsenic speciation in aquifer sediment under varying groundwater regime and redox conditions at Jianghan Plain of Central China.SCIENCE OF THE TOTAL ENVIRONMENT,607,992-1000.

Duan, Yanhua,et al."Arsenic speciation in aquifer sediment under varying groundwater regime and redox conditions at Jianghan Plain of Central China".SCIENCE OF THE TOTAL ENVIRONMENT 607(2017):992-1000.