| 氧化与还原条件下水稻土重金属形态特征的对比 |
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| 引用本文： | 齐雁冰,黄标,Darilek J L,王志刚.氧化与还原条件下水稻土重金属形态特征的对比[J].生态环境,2008,17(6). |
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| 作者姓名： | 齐雁冰 黄标 Darilek J L 王志刚 |
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| 作者单位： | 1. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏,南京,210008;平顶山工学院测量与国土信息系,河南,平顶山,467044
2. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏,南京,210008 |
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| 基金项目： | 国家自然科学基金项目
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| 摘 要： | 还原状态下的水稻土被风干处理后氧化还原等性质发生明显变化,对重金属的形态特征产生影响,进而影响对作物有效性的评价.利用BCR连续萃取法研究了张家港市南部不同pH水稻土在还原和氧化条件下Cu、Pb、Ni和Cd的形态变化状况.结果显示,氧化还原对重金属形态分配具有显著影响,而pH对Ni在还原状态下的形态分配有显著影响,对Cu、Pb和Cd形态分布影响不显著.样品经风干氧化处理后,氧化物结合态重金属均表现为不同程度的降低;Cu残渣态比例增加25%,氧化物结合态和有机结合态比例有所降低;Pb有机结合态比例增加33%,残渣态减少33%,酸可提取态和氧化物结合态变化不大;Ni受氧化还原条件影响更为强烈,表现为酸可提取态所占比例降低超过25%,氧化物结合态亦明显降低,残渣态提高超过60%;对Cd的影响主要表现为有机结合态所占比例降低约15%,残渣态提高约35%,酸可提取态和氧化物结合态变化不明显.氧化状态下的重金属形态并不是重金属在田间的真实状况,可能高估了Pb,低估Cu、Ni和Cd重金属在土壤中的危害性.
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| 关 键 词： | 氧化状态 还原状态 重金属形态 水稻土 |
Comparison of heavy metal fractions distribution in paddy soil under anoxic and oxidized conditions |
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| Qi Yanbing,Huang Biao,Darilek J L,Wang Zhigang.Comparison of heavy metal fractions distribution in paddy soil under anoxic and oxidized conditions[J].Ecology and Environmnet,2008,17(6). |
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| Authors: | Qi Yanbing Huang Biao Darilek J L Wang Zhigang |
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| Institution: | Qi Yanbing1,2,Huang Biao1,Derlek J L 1,Wang Zhigang1 1. State Key Laboratory of Soil , Sustainable Agriculture,Nanjing Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China,2. Department of Surveying , Geo-infromatics,Pingdingshan Institute of Technology,Pingdingshan 467044 |
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| Abstract: | Anoxic paddy soil could be oxidized by air in dryness pretreatment procedure,which resulted in different impact on heavy metal fractions during the sequential extraction procedure, as well as resulted in impact on the assessment of their plant availability.The fractions of Cu,Pb,Ni and Cd in different pH soil in southern of Zhangjiagang City were investigated by the BCR sequential extraction schemes under anoxic and oxidized conditions.The results indicated that, the fractions of heavy metals were significa... |
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| Keywords: | oxidized condition anoxic condition heavy metal fractions paddy soil |
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