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Influence of Reducing Conditions on Metallic Elements Released from Various Contaminated Soil Samples

机译：还原条件对各种污染土壤样品释放金属元素的影响

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The redox conditions of soil may have significant consequences for the mobility of metallic elements (ME), but unlike pH, very few studies have investigated this parameter. A procedure was established to study the solubilization of ME from soil samples in various reducing conditions using a batch method and sodium ascorbate solutions. The change in redox potential from +410 to +10 mV was studied from four contaminated soil samples (designated A-D) of different origins and compositions. The results showed that ME mobilization greatly increased with decreasing redox potential within a limited and very sensitive range. Depending on the soil sample studied, various sensitive ranges of potentials were obtained (A, 220-345 mV; B, 280-365 mV; C, 260-360 mV; and D, 240-380 mV), and the induced percentages of ME mobilization varied (i.e., maximal values for Zn: A, 45%; B, 59%; C, 53%; and D, 58%). The results could be explained by the combined effect of potential and pH decrease on ME-carrying phases; in particular, Fe and Mn (oxy)hydroxides.
机译：土壤的氧化还原条件可能会对金属元素（ME）的迁移性产生重大影响，但与pH值不同，很少有研究调查此参数。建立了使用批处理方法和抗坏血酸钠溶液研究各种还原条件下土壤样品中ME增溶的程序。氧化还原电势从+410到+10 mV的变化是从四个污染污染的土壤样本（称为A-D）中选取的，这些样本的来源和组成不同。结果表明，在有限且非常敏感的范围内，ME的动员随着氧化还原电位的降低而大大增加。根据所研究的土壤样品，获得了各种敏感的电位范围（A，220-345 mV； B，280-365 mV； C，260-360 mV； D，240-380 mV），以及感生的百分比ME动员变化（即，Zn的最大值：A，45％； B，59％； C，53％； D，58％）。电位和pH降低对ME承载相的综合影响可以解释结果。特别是Fe和Mn（氧）氢氧化物。

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