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| Bioavailability evaluation of heavy metals in Yulin coal gasification slag |
| Received:November 17, 2020 |
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| KeyWord:coal gasification slag;heavy metal;bioavailability;thallium |
| Author Name | Affiliation | E-mail | | XIANG Wei-wei | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | | | LI Xia-long | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | | | YAN Jia-kun | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | | | LIU Cui-ying | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | | | WANG Jian-wu | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | 47552748@qq.com | | QU Xiang-xiang | Yulin University, Shaanxi Key Laboratory of Ecological Restoration in Shanbei Mining Area, Yulin 719000, China | |
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| Abstract: |
| In order to systematically evaluate the bioavailability of heavy metals in Yulin coal gasification slag, the chemical extraction method and biological evaluation method(plant indicator method and microbial evaluation method) were used. The results showed that most of the heavy metals in fine slag were in the non-residuals state, and the content was greater than 90%; the content of cadmium, mercury, arsenic, zinc, thallium, vanadium, and antimony in coarse slag was about 90%, and the content of other heavy metals was low. The thallium contents in the stems and leaves of soybean seedlings cultured with fine slag were 2 189.3 μg·kg-1 and 570.1 μg·kg-1, respectively. The thallium contents in the stems and leaves of soybean seedlings cultured with coarse slag were 550.0 μg·kg-1 and 99.6 μg·kg-1, respectively, which exceeded the safety limit of thallium in edible plants(0.03~0.3 mg·kg-1). The contents of lead, mercury, nickel, and chromium in the leaves of soybean seedlings cultured with coal gasification slag exceeded the national standard. The heavy metal content of bacteria cultured with fine slag was significantly higher than that of bacteria cultured with coarse slag; the most of cellular content cultured by the fine slag was one order of magnitude greater than that of cultured by the coarse slag. In conclusion, the chemical extraction method, plant indicator method, and microbial evaluation all indicated that the heavy metal bioavailability and toxicity of Yulin gasification fine slag were stronger than those of coarse slag. The addition of large amounts of coal gasification slag could cause the accumulation of heavy metals in plants. Therefore, it should be cautious about directly using the coal gasification slag for soil and water remediation. |
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