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环境化学  2015 

炭石灰体系对于土壤中Cd赋存形态的影响

Keywords: 炭石灰,Cd,化学固定,赋存形态,重金属

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Abstract:

研究了熟石灰与活性炭组成的炭石灰体系用于固定土壤中Cd的可行性,考察了熟石灰/活性炭配比及炭石灰用量、土壤有机质和pH等对固定过程中镉赋存形态的影响,并初步探讨了固定机理和耐酸冲击负荷能力.研究结果表明,随着炭石灰的用量以及炭石灰中熟石灰用量的增加,交换态Cd均逐渐减少,同时碳酸盐结合态、铁锰氧化物结合态Cd增加.土壤有机质含量及pH值的增加,有利于提高炭石灰对交换态Cd的固定效率,降低土壤中交换态镉的含量,同时碳酸盐结合态、铁锰氧化物结合态和有机质结合态Cd含量增加.FTIR分析表明炭石灰主要通过化学沉淀、络合和物理吸附等方式固定土壤中的镉.初步的研究结果表明经炭石灰化学固定后的土壤对酸性高的降水具有较强的耐受性.

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