摘要
选择黔中地区的4条石灰土剖面作为研究对象,经过精细采样分析,讨论了石灰土形成过程中U富集的地球化学特征及其对生态环境存在的潜在风险.结果表明:1)岩—土界面是U既发生大量淋失而又产生显著富集的重要地球化学场所;2)处于中性条件下的石灰土剖面,释放的U优先与风化流体中的CO32-发生络合而进一步迁移淋失;3)石灰土剖面既是表生介质中重要的U储库,又是U的重要次生释放源,剖面的进一步演化将对环境生态构成潜在的放射性危害.
Four limestone soil profiles were selected as the subject investigated in Middle Guizhou. Through careful sampling and analyzing, this paper discussed geochemical charac- teristics of U and its potential risk on superficial environment. The results show： 1 ） the rock-soil interface is a main place for geochemical reaction, where U is both leached plenti- fully and markedly relatively riehened;2 ） when pH is neutral, U released from limestone soil profiles is preferentially complexed with CO32- of weathering solution and further leached ;3 ） limestone soils are important reservoirs as well as secondary releasing origins of U in superficial media. Further development of profiles will pose potential radioactive risk on ecological environment.
出处
《南华大学学报（自然科学版）》
2012年第4期18-24,共7页
Journal of University of South China：Science and Technology
基金
国家自然科学基金项目资助(40973070)
关键词
铀
岩溶区
石灰土
富集
贵州
uranium
karst region
limestone soil
enrichment
Guizhou Province
