摘要
试验采用火焰原子吸收法测定土壤中的铅在不同时期不同形态的变化,分析含磷赤泥颗粒对土壤重金属铅的影响,为重金属铅污染土壤修复提供一套可行方案。结果表明,在30 d的修复期内,施加1/2P-5%赤泥的残渣态铅含量在5 d、20 d和30 d时比空白对照增加了34.0(5 d)、31.5(20 d)和30.5(30 d)个百分点,碳酸盐结合态含量降低9.0(5 d)、9.5(20 d)和6.5(30 d)个百分点,铁锰氧化结合态含量降低18.0(5 d)、19.5(20 d)和18.5(30 d)个百分点。模拟土样中加1/8P-5%赤泥处理的交换态铅含量在5 d、20 d、30 d时降幅最大,分别降低了39.5(5 d)、29.0(20 d)、21.0(30 d)个百分点,说明含磷赤泥颗粒对土壤铅具有很好的钝化作用。
The changes in content of different forms of Pb at different periods were determined by flame atomic absorption spectrometry and the effects of phosphorus-contained red mud particles on Pb in soil were analyzed in order to provide a set of possible options for restoring Pb contaminated soil.The results showed that during 30 d of restoration period,in comparison with blank control,the content of residual form of Pb in treatment of applying 1/2P-5% red mud on the 5th d,the 20th d and the 30th d increased by 34.0 percentage points,31.5 percentage points and 30.5 percentage points,respectively;the content of carbonate bounded form of Pb decreased by 9.0 percentage points,9.5 percentage points and 6.5 percentage points,respectively;the content of Fe-Mn oxide bounded form of Pb declined by 18.0 percentage points,19.5 percentage points and 18.5 percentage points,respectively.The content of ion exchange form of Pb in simulated soil with treatment of applying 1/8P-5% red mud on the 5th d,the 20thd and the 30th d decreased the most by 39.5 percentage points,29.0 percentage points and 21.0 percentage points,respectively.Therefore,phosphorus-contained red mud particles have good inactivation effects on Pb in soil.
出处
《湖南农业科学》
2013年第6期37-41,共5页
Hunan Agricultural Sciences
基金
农业部农药检定所项目(NYCL20100110)
关键词
土壤
磷赤泥
修复
铅
soil
phosphorus-contained red mud
restoration
Pb
