| 彭雅茜,张世熔,王怡君,钟钦梅,冯灿.叶酸和蛋氨酸辅助提升单一螯合剂去除土壤重金属的研究[J].农业环境科学学报,2018,37(8):1667-1675. |
| 叶酸和蛋氨酸辅助提升单一螯合剂去除土壤重金属的研究 |
| Effects of folic acid and methionine on chelating agents in the removal of heavy metals |
| 投稿时间：2018-04-07 |
| DOI：10.11654/jaes.2018-0449 |
| 中文关键词: 污染土壤 重金属 环境友好 有机酸 复合浸提 |
| 英文关键词: contaminated soil heavy metals eco-friendly agents organic acid composite washing |
| 基金项目:四川省科技支撑计划项目（2014NZ0044）；四川农业大学科研兴趣培养计划项目（ky2016132） |
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| 摘要点击次数: 1884 |
| 全文下载次数: 1958 |
| 中文摘要: |
| 为探究辅助剂在土壤重金属浸提过程中对单一螯合剂的提升效果，通过振荡浸提法分别研究了叶酸（FA）和蛋氨酸（Met）作为辅助剂提升柠檬酸（CA）、柠檬酸铵（AC）和2-膦酸丁烷-1，2，4-三羧酸（PBTCA）对铅锌矿区土壤重金属的去除率及影响因素。结果表明：与单一螯合剂浸提相比，FA或Met的加入可显著提高螯合剂对重金属的去除率（P<0.05）。在酸性条件下，FA对CA去除土壤Cd和Zn的提升率最高，分别可达10.45%和12.08%，对AC去除Pb的提升率最高，达19.65%；Met对PBTCA去除土壤Cd、Pb和Zn的最大提升率分别为0.22%、8.60%和7.09%。复合浸提剂对土壤Cd、Pb和Zn的去除率随时间增加先上升然后趋于平稳。当混合浸提液pH为4、浸提时间为120 min时，3种重金属的去除率最高可达61.98%、76.57%和49.20%。复合浸提通过显著降低酸溶态、可还原态和部分可氧化态的重金属（P<0.05），实现高效修复。研究表明，FA和Met可辅助改进螯合剂的浸提效果。 |
| 英文摘要: |
| Soil washing is a promising and efficient method for remediating metal-contaminated soils. To explore the effects of citric acid (CA), ammonium citrate(AC), and 2-phosphonobutane-1, 2, 4-tricarboxylic acid(PBTCA)on cadmium, lead, and zinc removal, batch soil washing tests were carried out with two assistant reagents, namely, folic acid(FA)and methionine(Met). Results showed that the addition of FA or Met significantly improved the heavy metal removal efficiencies(P<0.05). The maximum improvements in soil heavy metal removal were 10.45% and 12.08% for Cd and Zn, respectively, with the addition of FA under acidic conditions compared with CA alone, and 19.65% for Pb removal with the addition of FA compared with AC alone. The augmentations to removal rates in soil Cd, Pb, and Zn were 0.22%, 8.60%, and 7.09%, respectively, via Met addition compared with PBTCA alone. The metal removal efficiencies increased with increasing contact time and then tended to plateau when washing occurred with washing agents combined by one assistant reagent and one chelating agent. The highest removal efficiencies of Cd, Pb, and Zn for compounded extraction agent reached 61.98%, 76.57%, and 49.20%, respectively, at pH 4.0 and a leaching time of 120 min. The exchangeable, reducible, and oxidizable fractions of Cd, Pb, and Zn in the soil decreased significantly after washing with the combined assistant reagents and chelating reagents. These findings indicate that the addition of FA or Met with chelating agents could enhance the removal of soil heavy metals. |
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