淹水对土壤重金属浸出行为的影响及机制研究

Effect of flooding on leaching behavior of heavy metals in soil and its mechanism

通过模拟库区周围受污染土壤的淹水条件,开展淹水试验探究土壤重金属浸出行为发展规律。从分析结果来看,在土壤内物质的氧化反应受到抑制的情况下,受土壤Eh下降、氧化铁形态转化等因素的影响,重金属浸出量逐渐减少,酸溶态、残渣态重金属逐渐减少,可还原态和可氧化铁的重金属增加,呈现出由表层向下迁移的发展态势。

By simulating the flooding conditions of contaminated soil around the reservoir area, the flooding experiment was carried out to explore the development law of soil heavy metal leaching behavior. According to the analysis results, under the condition that the oxidation reaction of soil materials is inhibited, the leaching amount of heavy metals is gradually reduced, the acid soluble and residual heavy metals are gradually reduced, and the reducible and iron oxide heavy metals are increased, showing the development trend of downward migration from the surface layer.