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首页> 外文期刊>Journal of Contaminant Hydrology >Prospective modeling with Hydrus-2D of 50 years Zn and Pb movements in low and moderately metal-contaminated agricultural soils
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Prospective modeling with Hydrus-2D of 50 years Zn and Pb movements in low and moderately metal-contaminated agricultural soils

机译：在低度和中度金属污染的农业土壤中使用Hydrus-2D对Zn和Pb的50年移动进行前瞻性建模

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Results of detailed modeling of in situ redistribution of heavy metals in pedological horizons of low and moderately metal contaminated soils, considering distinctly different long-term land use, are scarcely reported in literature. We used Hydrus-2D software parameterized with abundant available local soil data to simulate future Zn and Pb movements in soils contaminated by metallurgical fallout in the 20th century. In recent work on comparing different modeling hypotheses, we validated a two-site reactive model set with adjusted chemical kinetic constant values by fitting the 2005 Zn and Pb concentration profiles in soils, with estimated 1901-1963 airborne Zn and Pb loads (Mallmann et al., 2012a). In the present work, we used the same approach to simulate 2005-2055 changes in Zn and Pb depth-distribution and soil-solution concentrations, comparing two hypotheses of chemical equilibrium: i) the validated two-site model (one site at equilibrium and the other involved in kinetic reactions with pore water) set with adjusted kinetic EDTA extraction constants, and ii) a non-linear one-surface site adsorption equilibrium model. Simulated transfers were found generally lower and more realistic when using the two-site model. Simulations showed that consistent Zn redistribution and loss occurred in the moderately contaminated soil until 2055, i.e., more than one century after the main metal deposition, but negligible in low contaminated soils. Transfer of Pb was small in the three soils and under both hypotheses. In 2055, simulated Zn outflow concentrations remained under threshold values for drinking water.
机译：考虑到长期土地使用的明显不同，在低度和中度金属污染土壤的土壤学视野中重金属原位再分布的详细模型化结果在文献中几乎没有报道。我们使用了Hydrus-2D软件，该软件参数化了大量可用的本地土壤数据，以模拟20世纪受冶金尘污染的土壤中未来Zn和Pb的运动。在比较不同模型假设的最新工作中，我们通过拟合土壤中的2005年Zn和Pb浓度分布图，估算了1901-1963年的机载锌和Pb负荷，验证了具有调整后的化学动力学常数值的两点反应模型集（Mallmann等。，2012a）。在目前的工作中，我们使用相同的方法模拟了2005-2055年锌和铅深度分布和土壤溶液浓度的变化，比较了两种化学平衡假设：i）经过验证的两点模型（一个点处于平衡状态，另一点处于平衡状态）。另一个涉及与孔隙水的动力学反应），并设置了经过调整的动力学EDTA萃取常数，以及ii）非线性单面吸附平衡模型。当使用两站点模型时，发现模拟传输通常更低且更现实。模拟表明，直到2055年，即主要金属沉积后一个多世纪，在中等污染的土壤中均发生了一致的Zn再分布和损失，但在低污染的土壤中则可以忽略不计。在这两种假设下，Pb在三种土壤中的转移均很小。 2055年，模拟的锌流出浓度仍低于饮用水的阈值。

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