腐殖酸及酸雨对贫铀在土壤中迁移的影响研究

 利用经过完善的贫铀迁移模型,研究腐殖酸(HA)及酸雨对贫铀在土壤中迁移的影响.结果表明,对照组(北京地区土壤)DU迁移到达9~11cm,分别添加2%、5%、10%HA的实验组DU迁移依次降低,分别为21~23cm、15~17cm、11~13cm,说明腐殖酸促进了DU迁移; pH值为4.0和3.0的模拟酸雨,分别使贫铀迁移至29~31cm及35cm以上,说明酸雨促进了贫铀迁移;在酸雨和腐殖酸综合作用下贫铀迁移仅到5~7cm,说明腐殖酸和酸雨综合作用抑制了贫铀迁移.

Impact of humic acid and acid rain on the migration of depleted uranium in soils

The impact on the migration of depleted uranium in soils by humic acid and acid rain was studied using the improved DU migration model. The results showed that DU migrated to 9~11cm in control group(soils in beijing). In groups that 2%HA, 5%HA, 10%HA was added in soils, DU migrated further to 21~23cm,15~17cm,11~13cm, respectively, demonstrating that humic acid promoted the migration of depleted uranium. Leached by the simulated acid rain whose pH was 4.0and 3.0, DU migrated to 29~31cm and more than 35cm respectively, demonstrating that acid rain promoted the migration of depleted uranium. However,under the combined action of humic acid and acid rain, DU migratied to 5~7cm only, suggesting they restrained each other.