Corrosion process was investigated of depleted uranium (DU) ammunition fragments buried for three years in aerobic soils continuously irrigated with water. The continuing corrosion process was triggered through formation of soluble uranyl oxyhydrate phases such as metaschoepite and becquerelite, which were identified by micro-Raman and X-ray diffraction spectroscopy. The soil was not amended by phosphates and, therefore, no uranyl phosphates were found as corrosion products on the DU surfaces by X-ray photoelectron spectroscopy. A speciation modelling at high temporal sequence (chronospeciation approach) indicated that the abundant Fe oxyhydroxides in the soil immobilized the U(IV) released through DU corrosion. During the first two years, therefore, only <10 mg of U(VI) was thus found in the leachates from the soil columns, even though >3 g of DU had been corroded. However, the degree of this immobilization was found to be controlled by the amount of dissolved inorganic and organic carbon (DIC and DOC) in the soil pore water providing for U(VI) complexation competing with surface complexation by the Fe hydroxides. The chronospeciation approach applied is useful to improve our understanding and ability to predict the long-term fate of U(VI) and the mechanisms controlling U(VI) mobility in soil contaminated with DU shells.

研究了在连续用水灌溉的需氧土壤中埋藏三年的贫铀弹药的腐蚀过程。持续的腐蚀过程是通过形成可溶的铀酰氧基水合物相（如变硬石膏和贝克拉石）触发的，这些相已通过显微拉曼光谱和X射线衍射光谱法鉴定。土壤没有被磷酸盐修饰，因此，通过X射线光电子能谱法未在DU表面上发现铀酰磷酸盐作为腐蚀产物。在高时间序列上的一种形态学模型（时间形态学方法）表明，土壤中大量的羟基氧化铁固定了通过DU腐蚀释放的U（IV）。因此，在前两年中，即使>，在土壤渗滤液中也仅发现了<10 mg的U（VI）。3 g的DU被腐蚀了。然而，发现这种固定化程度是由土壤孔隙水中溶解的无机碳和有机碳（DIC和DOC）的量控制的，土壤中的碳提供了U（VI）络合与铁氢氧化物的表面络合竞争。所采用的时间形态学方法有助于提高我们的认识和预测U（VI）的长期命运以及控制被DU壳污染的土壤中U（VI）迁移率的机制的能力。