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• W3128504189 endingPage "145510" @default.
• W3128504189 startingPage "145510" @default.
• W3128504189 abstract "Coal fire sponges (CFS) are common in coal-fire areas. Due to the enrichment of Hg in CFS, large amounts of Hg are released by CFS into the atmosphere via natural weathering or solar radiation. Therefore, CFS should be of concern in Hg pollution management and control globally. In addition, CFS changes the Hg cycle path by capturing Hg from coal fires that would have entered the atmosphere. In this study, the concentration, distribution, species, and enrichment mechanism of CFS Hg were investigated. The results showed that the Hg concentration in CFS ranged from 1008 to 35,310 ng/g, with an average of 8932 ng/g (CFS number, n = 153). The Hg concentration of CFS in different types of land was found to be significantly inhomogeneous. To determine the status of subterranean spontaneous combustion, the Hg concentration was added, which can improve the effect of coal-fire monitoring. Compared to the background area topsoil, CFS was enriched in Hg, acid, SO 4 2− , and total fluoride. The Hg species in CFS was primarily HgSO 4 , followed by HgO. However, the primary Hg species in the surrounding topsoil were HgCl 2 and HgO. By the simulation experiment, it was determined that hydrofluoric acid (HF) was beneficial to activate the stable species in the coal-fire areas. HgCl 2 , HgO, or Hg 0 were ionized by acid liquor or HF, which can promote Hg migration and increase the adsorbed ratio; in the presence of SO 4 2− , the primary Hg species was HgSO 4 . Ultimately, Hg was absorbed by clay minerals and organic matter. The high-efficiency activation of steady Hg species by the coal-fire HF should be studied further. • Mercury, acid, sulfur, and total fluoride were enriched in coal fire sponge (CFS). • Mercury species in CFS were primarily HgSO 4 , followed by HgO. • Distribution of sulfur and fluorine ion fragments in CFS was dispersed. • Mercury was adsorbed by clay minerals and enriched in CFS, with the form of HgSO 4 . • Exploring the subterranean spontaneous combustion by evaluating mercury concentration in coal fire sponges" @default.
• W3128504189 created "2021-02-15" @default.
• W3128504189 creator A5033199243 @default.
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• W3128504189 date "2021-06-01" @default.
• W3128504189 modified "2023-10-15" @default.
• W3128504189 title "Role of H+, HF, SO42− and kaolin in fixing Hg of coal fire sponge" @default.
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• W3128504189 doi "https://doi.org/10.1016/j.scitotenv.2021.145510" @default.
• W3128504189 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33770854" @default.

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