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Redox reactions and the influence of natural Mn oxides on Cr oxidation in a contaminated site in northern Italy: evidence from Cr stable-isotopes and EPR spectroscopy

机译:氧化还原反应及天然Mn氧化物对意大利污染部位Cr氧化的影响:来自Cr稳定同位素和EPR光谱的证据

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Hexavalent chromium-contaminated groundwaters and sediments in northern Italy have been studied using the Cr stable-isotope systematics and electron spin resonance spectroscopy (ESR), in order to explore redox changes and soil-groundwater interactions. The isotopic data indicate a possible Cr(VI) source released into the environment from an industrial plant. EPR spectra on the sediments which constitute the aquifers show a broad asymmetric absorption due to coupled Fe(III) and coupled Cr(III) ions and a well resolved hyperfine structure due to manganese ions, resulting from Mn(IV) and Mn(II). The isotopic and EPR data support the hypothesis of Cr(III) being oxidized by Mn oxides which are widespread in the aquifer, possibly related to the oscillation of the phreatic level. The obtained results highlight the usefulness of chromium stable isotopes as environmental tracers and support the observations that naturally occurring Mn oxides in soils may catalize Cr oxidation from the stable Cr(III) form to the toxic Cr(VI) soluble form, yielding valuable information in planning remediation interventions.
机译:六价铬污染地下水和沉积物在意大利北部一直在使用铬稳定同位素系统和电子自旋共振谱(ESR)研究,以探讨氧化还原变化和土壤,地下水的交互作用。同位素数据表明来自工厂释放到环境中的可能的Cr(VI)源。上构成的含水层表现出广泛的非对称吸收由于耦合的Fe(III)和耦合铬(III)离子和良好分辨的超精细结构由于锰离子,选自Mn(IV)和Mn得到的沉积物EPR谱(II) 。同位素和EPR数据支持的Cr(III)的假设通过Mn的氧化物,其是广泛分布于含水层,可能涉及到水位的振荡被氧化。将所得到的结果突出铬稳定同位素作为环境示踪剂的有用性,并支持意见,即在土壤中天然存在的锰氧化物可以catalize从稳定的Cr(III)的形式向有毒的铬(VI)的可溶形式的Cr氧化,得到在有价值的信息规划整治措施。

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