https://scholars.lib.ntu.edu.tw/handle/123456789/561274
標題: | Arsenic contamination in abandoned and active gold mine spoils in Ghana: Geochemical fractionation, speciation, and assessment of the potential human health risk | 作者: | Mensah, A.K. Marschner, B. Shaheen, S.M. Wang, J. Wang, S.-L. Rinklebe, J. SHAN-LI WANG |
關鍵字: | Arsenic mobilisation; Geochemical fractionation; Gold mine spoils; Human health risks; Soil contamination | 公開日期: | 2020 | 卷: | 261 | 來源出版物: | Environmental Pollution | 摘要: | This work aims to study the pseudo-total content, geochemical fractions, and species of arsenic (As) in the bulk soil and in the coarse and fine particles of top soil and soil profiles collected from active and abandoned gold mine spoils in Ghana. The human health risk for adults (male and female) and children has been assessed. To achieve our aims, we collected 51 samples, characterized them, determined the total As content, and sequentially extracted the geochemical fractions of As including water-soluble and un-specifically bound As (FI); specific-sorbed/exchangeable As (FII); poorly (FIII)- and well-crystalline (IV) Fe oxide; and residual/sulphide fraction (FV). In selected samples, As species were determined using synchrotron-based X-ray absorption near edge structure (XANES). Pseudo-total As contents varied from 1807 to 8400 mg kg?1, with the extremes occurring at the abandoned mine spoil. Arsenic was almost 10-fold higher in the fine particles (<0.63 μm) than in the coarse particles. Arsenic was mainly associated with FIII and FV, indicating that the distribution of As in these spoils is governed by their contents of amorphous Fe oxides, sulphides and As bearing minerals. The XANES results indicated that scorodite (FeAsSO4 = 65–76%) and arsenopyrite (FeAsS = 24–35%) are the two major As-containing minerals in the spoils. The potential mobility (PMF = ?FI-FIV) of As in the fine particles of the top soil was higher (48–61%) than in the coarse particles (25–44%). The mobile fraction (MF) (FI+FII) and PMF of As in the coarse particles of the profiles increased with depth while it decreased in the fine particles. The median hazard index values indicated an elevated human health risk, especially for children. The high contamination degree and potential mobility of As at the studied mine spoils indicate high potential risk for human and environmental health. ? 2020 Elsevier Ltd |
URI: | https://www.scopus.com/inward/record.url?eid=2-s2.0-85080024377&partnerID=40&md5=a9c535dc3634005e846f7e278361f80a https://scholars.lib.ntu.edu.tw/handle/123456789/561274 |
DOI: | 10.1016/j.envpol.2020.114116 | SDG/關鍵字: | Abandoned mines; Arsenic; Geochemistry; Gold mines; Health; Health risks; Iron oxides; Risk assessment; Soils; Sulfur compounds; X ray absorption; X ray absorption near edge structure spectroscopy; Geochemical fractionations; Human health risks; Mine spoil; Mobilisation; Soil contamination; Economic geology; aluminum; arsenic; calcium; carbon; iron; iron oxide; magnesium; manganese; phosphorus; sulfide; arsenic; gold; arsenic; gold mine; health impact; health risk; ore deposit; pollution exposure; public health; soil pollution; soil quality; Article; chemical composition; controlled study; fractionation; geochemistry; Ghana; health hazard; mining; particle size; pH; quantitative analysis; risk assessment; sand; soil pollution; child; environmental monitoring; human; soil; soil pollutant; Ghana; Feline immunodeficiency virus; Arsenic; Child; Environmental Monitoring; Ghana; Gold; Humans; Soil; Soil Pollutants |
顯示於: | 農業化學系 |
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