Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo 561-675, Republic of Korea.
Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo 561-675, Republic of Korea.
Environ Pollut. 2014 Mar;186:29-35. doi: 10.1016/j.envpol.2013.11.032. Epub 2013 Dec 20.
In this study, a combination of sequential extraction and mineralogical investigation by X-ray diffraction and X-ray photoelectron spectroscopy was employed in order to evaluate arsenic solid-state speciation and bioaccessibility in soils highly contaminated with arsenic from mining and smelting. Combination of these techniques indicated that iron oxides and the weathering products of sulfide minerals played an important role in regulating the arsenic retention in the soils. Higher bioaccessibility of arsenic was observed in the following order; i) arsenic bound to amorphous iron oxides (smelter-2), ii) arsenic associated with crystalline iron oxides and arsenic sulfide phase (smelter-1), and iii) arsenic associated with the weathering products of arsenic sulfide minerals, such as scorodite, orpiment, jarosite, and pyrite (mine). Even though the bioaccessibility of arsenic was very low in the mine soil, its environmental impact could be significant due to its high arsenic concentration and mobility.
在这项研究中，采用了连续提取和 X 射线衍射及 X 射线光电子能谱矿物学研究相结合的方法，以评估来自采矿和冶炼的高砷污染土壤中砷的固相结合态和生物可给性。这些技术的组合表明，氧化铁和硫化物矿物的风化产物在调节土壤中砷的固定方面发挥了重要作用。在以下顺序中观察到较高的砷生物可给性：i）与无定形氧化铁结合的砷（冶炼厂 2），ii）与晶态氧化铁和砷硫化物相结合的砷（冶炼厂 1），以及 iii）与砷硫化物矿物的风化产物（如雌黄铁矿、雄黄、黄钾铁矾和黄铁矿）结合的砷（矿）。尽管矿土中砷的生物可给性非常低，但由于其高砷浓度和迁移性，其环境影响可能是显著的。
