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Stabilization Effects of Mn(II)-Salts on Metaschoepite in Soil under Different Water Regimes
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-08-04 , DOI: 10.1021/acsearthspacechem.1c00213 Fuyu Guo 1, 2, 3 , Georgio Proctor 2 , Steven L. Larson 4 , John H. Ballard 4 , Heather M. Knotek-Smith 4 , Dongmei Cao 5 , Ruyi Yang 1 , Xingxiang Wang 3 , Fengxiang Han 2
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-08-04 , DOI: 10.1021/acsearthspacechem.1c00213 Fuyu Guo 1, 2, 3 , Georgio Proctor 2 , Steven L. Larson 4 , John H. Ballard 4 , Heather M. Knotek-Smith 4 , Dongmei Cao 5 , Ruyi Yang 1 , Xingxiang Wang 3 , Fengxiang Han 2
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Metaschoepite (UO3·2H2O) is a product of the corrosion of depleted uranium munition and is commonly found in former war zones and at military test sites. Understanding metaschoepite transformation and uranium (U) mobility is important for the sustainable operation of U-containing test-firing and nuclear waste disposal sites. In the present study, the stabilization effects of Mn(II)-salts on metaschoepite in soil under different water regimes (saturation and flooding) were investigated. Results indicated that the dissolution and transformation of metaschoepite were controlled by water regimes and redox processes in the soil system. The concentrations of water-extractable U in the metaschoepite-amended soils after 270 days of incubation for the saturation and flooding groups were 299 and 173 mg kg–1, respectively. The addition of Mn(II)-salts significantly retarded the release of U(VI) in the metaschoepite-amended soils. The U stabilization efficiency of Mn(II) was persistently > 90% during the 270 days of incubation, irrespective of water regimes. The X-ray photoelectron spectroscopy results showed no detectable reduction of liberated U(VI) in the “open waterlogged” soil system, while the X-ray diffraction analyses confirmed the transformation of metaschoepite with signals of schoepites disappearing over the course of the experiment. The study highlights the potential for the use of Mn(II)-salts in practical applications for in situ stabilization of U-contaminated sites and nuclear waste disposal.
中文翻译：
Mn(II)-盐在不同水分条件下对土壤中镁锌矿的稳定作用
Metaschoepite (UO 3 ·2H 2O) 是贫铀弹药腐蚀的产物，常见于前战区和军事试验场。了解 Metaschoepite 转化和铀 (U) 流动性对于含 U 试火和核废料处理场的可持续运行非常重要。在本研究中，研究了 Mn(II)-盐在不同水分条件（饱和和洪水）下对土壤中变斜云母的稳定作用。结果表明，变斜云母的溶解和转化受土壤系统中水分和氧化还原过程的控制。经过 270 天的孵化后，饱和和淹水组的后斜长石修正土壤中可水提取的 U 浓度分别为 299 和 173 mg kg –1，分别。Mn(II)-盐的添加显着延缓了变斜云母修正土壤中 U(VI) 的释放。在 270 天的孵化过程中，Mn(II) 的 U 稳定效率持续 > 90%，与水情无关。X 射线光电子能谱结果表明，在“开放浸水”土壤系统中未检测到释放的 U(VI) 减少，而 X 射线衍射分析证实了后斜云母的转化，而后斜云母的信号在实验过程中消失了。该研究强调了在实际应用中使用锰 (II) 盐来原位稳定 U 污染场地和核废料处理的潜力。
更新日期：2021-08-19
中文翻译：
Mn(II)-盐在不同水分条件下对土壤中镁锌矿的稳定作用
Metaschoepite (UO 3 ·2H 2O) 是贫铀弹药腐蚀的产物，常见于前战区和军事试验场。了解 Metaschoepite 转化和铀 (U) 流动性对于含 U 试火和核废料处理场的可持续运行非常重要。在本研究中，研究了 Mn(II)-盐在不同水分条件（饱和和洪水）下对土壤中变斜云母的稳定作用。结果表明，变斜云母的溶解和转化受土壤系统中水分和氧化还原过程的控制。经过 270 天的孵化后，饱和和淹水组的后斜长石修正土壤中可水提取的 U 浓度分别为 299 和 173 mg kg –1，分别。Mn(II)-盐的添加显着延缓了变斜云母修正土壤中 U(VI) 的释放。在 270 天的孵化过程中，Mn(II) 的 U 稳定效率持续 > 90%，与水情无关。X 射线光电子能谱结果表明，在“开放浸水”土壤系统中未检测到释放的 U(VI) 减少，而 X 射线衍射分析证实了后斜云母的转化，而后斜云母的信号在实验过程中消失了。该研究强调了在实际应用中使用锰 (II) 盐来原位稳定 U 污染场地和核废料处理的潜力。
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