添加不等量聚合氯化铝铁对固定土壤砷的影响
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摘要
为探索固定土壤砷的有效途径,选取按GB 15618—1995三级标准10倍砷含量人工配制的污染土壤进行添加不等量的聚合氯化铝铁试验。结果表明,添加聚合氯化铝铁对碳酸盐结合态的砷含量影响很小,但可以明显降低可交换态的砷含量。添加聚合氯化铝铁的质量分数在2%时,砷污染土样浸出液离子色谱图中的AsO_4~(3-)阴离子峰已经消失且砷的稳定效率能达到80%以上。添加质量分数为3%的聚合氯化铝铁,残渣态的砷含量比例从49.37%提高到88.15%。当添加聚合氯化铝铁质量分数在1%时,就能使土壤中砷的浸出浓度低于GB 5058.3—2007的限值5 mg/L。
In order to explore effective ways of fixing arsenic in soil,by selecting three standard GB15618—1995 arsenic levels of 10 times of the manual configuration contaminated soil to add varying amounts of polyaluminium ferric chloride to test. The results showed that the addition of polyaluminium ferric chloride have little effect for content of carbonate-bound arsenic,but can significantly reduce arsenic levels of exchangeable. Adding mass fraction of 2% PAFC,the peak of AsO_4~(3-) anionic of arsenic contamination soil leaching solution in ion chromatogram has disappeared and stabilization efficiency can reach more than 80%. Adding mass fraction of 3% PAFC,the highest arsenic levels of residue increased from49. 37% to 88. 15%. Adding mass fraction of 1% PAFC or more,the leaching concentration of arsenic in soil below GB 5058. 3—2007 limit 5 mg/L.
In order to explore effective ways of fixing arsenic in soil,by selecting three standard GB15618—1995 arsenic levels of 10 times of the manual configuration contaminated soil to add varying amounts of polyaluminium ferric chloride to test. The results showed that the addition of polyaluminium ferric chloride have little effect for content of carbonate-bound arsenic,but can significantly reduce arsenic levels of exchangeable. Adding mass fraction of 2% PAFC,the peak of AsO_4~(3-) anionic of arsenic contamination soil leaching solution in ion chromatogram has disappeared and stabilization efficiency can reach more than 80%. Adding mass fraction of 3% PAFC,the highest arsenic levels of residue increased from49. 37% to 88. 15%. Adding mass fraction of 1% PAFC or more,the leaching concentration of arsenic in soil below GB 5058. 3—2007 limit 5 mg/L.
引文
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[9]武斌,廖晓勇,陈同斌,等.石灰性土壤中砷形态分级方法的比较及其最佳方案[J].环境科学学报,2006,26(9):1467-1473.
[10]郑景华,王薪宇,范容桂,等.内蒙古某矿区土壤环境中砷的分布及赋存形态研究[J].地球与环境,2014,42(1):122-127.
[11]中国地质调查局.DD 2005—03中国地质调查局技术标准——生态地球化学评价样品分析技术要求(试行)[S].北京:中国地质调查局,2005.
[2]范拴喜,甘卓亭,李美娟,等.土壤重金属污染评价方法进展[J].中国农学通报,2010,26(17):310-315.
[3]赵慧敏.铁盐,生石灰对砷污染土壤固定/稳定化处理技术研究[D].北京:中国地质大学(北京),2010.
[4]吴宝麟.铅镉砷复合污染土壤钝化修复研究[D].长沙:中南大学,2014.
[5]国家环境保护局.GB 15618—1995土壤环境质量标准[S].北京:中国标准出版社,1995.
[6]国家环境保护局.HJ/T 300—2007固体废物浸出毒性浸出方法醋酸缓冲溶液法[S].北京:中国环境科学出版社,2007.
[7]Tessier A,Campbell P G C,Bisson M.Sequential extraction procedure for the speciation of particulate trace metals[J].Analytical Chemistry,1979,51(7):844-851.
[8]Rauret G,Lopez-Sanchez J F,Sahuquillo A,et al.Improvement of the BCR three step sequential extraction procedure prior to the certification of new sediment and soil reference materials[J].Journal of Environmental Monitoring,1999,1(1):57-61.
[9]武斌,廖晓勇,陈同斌,等.石灰性土壤中砷形态分级方法的比较及其最佳方案[J].环境科学学报,2006,26(9):1467-1473.
[10]郑景华,王薪宇,范容桂,等.内蒙古某矿区土壤环境中砷的分布及赋存形态研究[J].地球与环境,2014,42(1):122-127.
[11]中国地质调查局.DD 2005—03中国地质调查局技术标准——生态地球化学评价样品分析技术要求(试行)[S].北京:中国地质调查局,2005.