Effects of Adding Alkaline Material on the Heavy Metal Chemical Fractions in Soil under Flooded and Non-Flooded Conditions
Effects of Adding Alkaline Material on the Heavy Metal Chemical Fractions in Soil under Flooded and Non-Flooded Conditions
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DOI：
10.1080/15320383.2014.890169
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
H. Sumi;T. Kunito;Y. Ishikawa;K. Nagaoka;H. Toda;Yoshio Aikawa
中科院分区：
文献类型：
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作者：
H. Sumi;T. Kunito;Y. Ishikawa;K. Nagaoka;H. Toda;Yoshio Aikawa
研究了在淹水和非淹水条件下，添加碱性物质（含碳酸钙和石膏）对Cd、Zn轻度污染的水稻土中重金属（Cd、Cu、Pb和Zn）的固定效果。添加碱性物质后，土壤pH值升高，各金属交换态含量显著降低，其中Cd和Zn的交换态含量分别降低了75%和75%以上。在洪水和非洪水条件下，下降90%）。干燥的淹水土壤样品增加了交换性部分的比例，总的馏分，特别是镉。可交换部分的比例是较低的干燥，以前淹没的样品，含有碱性物质比在不含碱性物质的样品，表明添加碱性物质将是一种有效的方式，固定在缺氧土壤氧化过程中的重金属。这些结果表明，碱性物质在缺氧和好氧条件下都能对重金属进行修复，且淹水和碱性物质改良水稻土对重金属化学形态的影响不同。
We investigated the effect of adding an alkaline material (containing calcium carbonate and gypsum) on the immobilization of heavy metals (Cd, Cu, Pb, and Zn) in a paddy soil slightly contaminated with Cd and Zn under flooded and non-flooded conditions in the laboratory. Adding the alkaline material increased the soil pH and significantly decreased the exchangeable fraction of all of the metals, especially for Cd (>75% decrease) and Zn (ca. 90% decrease), under both flooded and non-flooded conditions. Drying the flooded soil samples increased the ratio of exchangeable fraction to the total fraction, particularly for Cd. The exchangeable fraction ratio was lower in the dried, previously flooded samples that contained the alkaline material than in the samples that did not contain the alkaline material, indicating that adding the alkaline material would be an effective way of immobilizing heavy metals during the oxidation of anoxic soils. These results show that the alkaline material can be used to immobilize heavy metals under both anoxic and oxic conditions, and that the effects of flooding and amending a paddy soil with alkaline material on the chemical forms will be different between heavy metals.