荒漠土壤颗粒中镅的结合形态研究  

Chemical species of Am in contaminated desert soil particles

作　　者：曾可[1] 周旭[1] 申茂泉[1] 韩朝阳[1] 马特奇[1] 

机构地区：[1]西北核技术研究所,西安710024

出　　处：《核技术》2012年第3期189-192,共4页Nuclear Techniques

摘　　要：采用连续提取法研究了某荒漠土壤颗粒中镅的结合形态,以评价事故状态下镅在土壤中的迁移性。结果表明,大于1 mm土壤颗粒中镅主要存在于铁锰氧化物结合态中(19.5%–60.9%),随土壤粒径减小,有机结合态及残渣态的镅含量增加。镅的结合形态与土壤颗粒中有机质及伊利石含量正相关,与氧化铁含量负相关。假设该类漠土区域出现事故性镅污染,镅较难在该类土壤中迁移。在镅来源单一情况下,影响镅结合形态的主要因素为土壤的有机质含量及矿物化学组成。Chemical species of Am in contaminated desert soil particles was investigated by using the standard sequential extraction procedures, so as to assess the mobility of Am in soil in nuclear accident. It was found that 19.5%-60% of Am was bound to reducible fraction. The content of ^241Am bound to oxidisable and residual fraction increased with decreasing particle size. High correlations were found between the Am concentration and amount of organic, Illite, Fe203 matter in soil particles. The results showed that Am is difficult to migrate in this site. Organic and mineral matters play an important part for Am accumulation in soils.

关 键 词：荒漠土 土壤颗粒 镅 结合形态 

分 类 号：X591[环境科学与工程—环境工程]