CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi 710075, China.
Chemosphere. 2014 Jan;95:193-9. doi: 10.1016/j.chemosphere.2013.08.065. Epub 2013 Sep 16.
The potential environmental hazards posed by trace elements have assumed serious proportions due to their toxicity, bioavailability and geochemical behavior. The toxicity and mobility of trace elements in coal gangue is dependent on the elements' chemical properties, therefore, the quantification of the different forms of trace elements is more significant than the estimation of their total concentrations. In this study, the mobility behavior of trace elements in coal gangue from the Huainan Coalfield was studied to evaluate the potential eco-toxicity of the trace elements. Sequential extraction was employed to analyze the fractionation behavior of trace elements in coal gangue. The selected trace elements (As, Co, Cr, Cu, Mn, Ni, Se, Sn, V and Zn) are predominantly found in silicate-bound, sulfide-bound and carbonate-bound fractions. The correlation of the element concentration with ash yield, aluminum, calcium and iron-sulfur indicates that As, Co, Cu, Ni, Se and Zn in coal gangue are mainly associated with sulfide minerals, which could release from coal gangue easily and can disperse into the environment as a result of long-term natural weathering. The Risk Assessment Code reveals that the trace elements (Mn, Cr, Se, Ni, Zn, As and Cu) can pose serious environmental risks to the ecosystem. The fractionation profiles of other elements (Co, Sn and V) indicate no risk or low risk to the environment.
由于微量元素的毒性、生物可利用性和地球化学行为，其对环境造成的潜在危害已达到严重程度。煤矸石中微量元素的毒性和迁移性取决于元素的化学性质，因此，对微量元素不同形态的定量比估计其总浓度更为重要。本研究对淮南煤田煤矸石中微量元素的迁移行为进行了研究，以评估微量元素的潜在生态毒性。采用连续提取法分析了煤矸石中微量元素的分馏行为。选择的微量元素（As、Co、Cr、Cu、Mn、Ni、Se、Sn、V 和 Zn）主要存在于硅酸盐结合、硫化物结合和碳酸盐结合相中。元素浓度与灰分产率、铝、钙和铁硫的相关性表明，煤矸石中的 As、Co、Cu、Ni、Se 和 Zn 主要与硫化物矿物有关，这些硫化物矿物可能会在长期的自然风化过程中从煤矸石中释放出来，并分散到环境中。风险评估代码显示，微量元素（Mn、Cr、Se、Ni、Zn、As 和 Cu）可能对生态系统造成严重的环境风险。其他元素（Co、Sn 和 V）的分馏谱表明对环境没有风险或风险较低。
