喀斯特
地下水
Mercury(编程语言)
土层
水文学(农业)
土壤水分
矿化(土壤科学)
流域
环境科学
地质学
地表径流
土壤污染
环境化学
土壤科学
化学
生态学
地理
生物
古生物学
地图学
计算机科学
岩土工程
程序设计语言
作者
Jicheng Xia,Jianxu Wang,Leiming Zhang,Xun Wang,Wei Yuan,Tao Peng,Lirong Zheng,Wenxi Tian,Xinbin Feng
出处
期刊:Water Research
[Elsevier]
日期:2022-11-01
卷期号:226: 119271-119271
被引量:5
标识
DOI:10.1016/j.watres.2022.119271
摘要
Guizhou Province is located in the heart of a karst zone in southwest China, which is one of the largest karst areas in the world. Given the fragile surface ecosystem and highly developed underground karst structure, the migration and transformation of soil Hg may impact groundwater quality in karst environments with high Hg background concentrations. This study examines the vertical migration and transformation of soil mercury (Hg) in two karst catchments, Huilong and Chenqi, with the former containing high Hg contents associated with mineralization and the latter representing regional background Hg. The results show that the soil Hg pool in the Huilong catchment was as high as 44.4 ± 4.2 g m−2, whereas in the Chenqi catchment was only 0.17±0.02 g m−2. Compared with farmland soil, forest soil showed a significant loss of Hg. The results of L3 X-ray absorption near edge structure of Hg indicated that α-HgS, the primary mineral of Hg ore, gradually changed to other mineral types during soil formation. In Huilong catchment, the proportion of organic bound Hg(SR)2 out of total Hg decreased from 44.0% to 20.3% when soil depth increased from 10 cm to 160 cm in farmland soil profile and from 39.3% to 34.5% in forest soil profile, while the proportion of ionic Hg increased with soil depth, from 4.2% to 10.7% in the farmland soil profile and from 6.7% to 11.6% in the forestland soil profile. Results from the triple-mixing isotope model show that soil Hg accounts for more than 80% Hg in groundwater in the two catchments. Results from this study indicate potential risks of soil Hg entering into groundwater in this karst area.
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