Aging effect on the leaching behavior of heavy metals (Cu, Zn, and Cd) in red paddy soil
Aging effect on the leaching behavior of heavy metals (Cu, Zn, and Cd) in red paddy soil
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DOI：
10.1007/s11356-015-4386-x
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发表时间：
2015-08-01
影响因子：
5.8
通讯作者：
Zeng, Guangming
中科院分区：
文献类型：
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作者：
Huang, Bin;Li, Zhongwu;Zeng, Guangming
老化效应会影响金属加入土壤后的组分分布和迁移率。本研究通过模拟酸雨条件下的培养和土柱试验，评价老化对人工污染红稻土中Cu、Zn、Cd淋溶特性的影响。我们的结果表明，老化效应降低了可交换组分和 HoAc 可溶组分中的金属含量。幂函数最能很好地描述可交换分数的变化，而伪一阶和二阶函数更能成功地描述金属从土柱中的淋滤特性。污染土壤中金属的淋失量仅占土壤总含量的一小部分，其中Cu的淋失能力最弱。可交换组分和HoAc可溶组分均可作为评价红壤中金属浸出性的指标。土壤被污染的时间越短，从土壤中释放的金属量就越多。老化效应引起的可交换分数的减少是土壤中金属迁移率下降的主要原因。
Aging effect can influence the fractions distribution and mobility of metals after they are added into soil. In this study, incubation and soil column experiments under simulated acid rain condition were conducted to evaluate aging effect on the leaching characteristic of Cu, Zn, and Cd in artificial polluted red paddy soil. Our results showed that aging effect reduced metal contents in exchangeable and HoAc soluble fractions. Power function was the most excellent to describe the variation of exchangeable fraction, while pseudo first- and second-order functions were more successful to describe the leaching characteristic of metals from soil columns. The leaching amount of the metals from the polluted soil only accounted for a small part of their total content in soil, and the leachability of Cu was the weakest. Both the exchangeable and HoAc soluble fraction were available as indicators to evaluate the leachability of metals in red paddy soil. The shorter time the soil was contaminated, the more amounts of metals released from the soil. The reduction of exchangeable fraction caused by aging effect was the main reason for the decrease of metal mobility in soil.