Novel insights into antimony mobilization in different high- antimony aquifers from the molecular signatures of dissolved organic matter

被引:0
|
作者
Hao, Chunming [1 ,2 ]
Sun, Qianqian [2 ]
Sun, Ximeng [2 ]
Li, Qiong [2 ,3 ]
机构
[1] Nantong Inst Technol, Nantong 226002, Jiangsu, Peoples R China
[2] North China Inst Sci & Technol, Sanhe 065201, Hebei, Peoples R China
[3] Xueyuan St 467, Sanhe 065201, Peoples R China
关键词
Molecules composition; Molecules structure; Antimony; Spectroscopic characteristics; Mining activities; RESOLUTION MASS DATA; GROUNDWATER; FLUORESCENCE; MECHANISMS; ESTUARY; BINDING; WATERS; CARBON; MINE; CONTAMINATION;
D O I
暂无
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The crucial role of the fluorescent components of dissolved organic matter (DOM) in controlling antimony (Sb) mobilization in groundwater has been confirmed. However, the molecular signatures contributing to Sb enrichment in DOM remain unknown. This study aims to investigate the origins and molecular compositions of DOM in different high-Sb aquifers (Sb-mining and no-Sb-mining aquifer), as well as compare different molecular signatures of DOM and mechanisms for Sb migration. The findings showed that Sb concentrations in Sb-mining aquifer exhibited a positive correlation with lignin- and tannin -like molecules characterized by high O/C and low H/C ratios, indicating an increased abundance of aromatic components with higher Humification Index and SUVabsorbance at 254 nm, compared to no-Sb-mining aquifer. Correspondingly, the complexation and competitive adsorption were considered as the predominate formation mechanisms on Sb enrichment in Sb-mining aquifer. In addition, high abundances of bioreactivity DOM may facilitated the migration of Sb via electron transfer and competitive adsorption in native no-Sb-mining aquifer. The outcomes of this investigation offer novel insights into the mechanism on Sb enrichment influenced by DOM at the molecule level.
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页数:12
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