摘要
为了解某铀矿区周边环境放射性污染特征和对周边居民产生的健康风险状况,对矿区周边农田土壤及溪流沉积物进行采集,测试分析^(238)U和^(232)Th活度浓度,采用箱线图及正态分布分析其活度浓度分布特征,借助地质累积评价模型和潜在生态评价模型,对比农田土壤及溪流沉积物的风险评价,从而完善整个尾矿库周边的评估过程。结果表明,^(238)U、^(232)Th含量变化具有显著相关性,为江西土壤背景值的20~40倍左右。随着离尾矿库距离的增大,污染组分^(238)U、^(232)Th浓度逐渐降低,随后保持稳定。溪流沉积物中的^(238)U、^(232)Th地质累积指数略大于农田土。农田土T1、T2点位距离尾矿库相对较近,土壤污染较为严重,导致地质累积指数结果远高于其他点位,呈现极重度污染。潜在生态风险评价中Er(^(238)U)和Er(^(232)Th)中强生态风险均占50%以上。调查区域出现整体中度程度,局部点位表现出严重污染,建议该地区采取治理措施。
In order to understand characteristics of radioactive contamination in surrounding environment of a uranium mining area and health risks to surrounding residents,farmland soil and river sediments around mining area were collected,activity concentrations and effective dose equivalent of ^(238)U and ^(232)Th were tested and analyzed,and distribution characteristics of activity concentration was analyzed by box plot and normal distribution.With the help of geological accumulation evaluation model and potential ecological evaluation model,risk assessment of farmland soil and river sediment is compared,so as to perfect entire evaluation process around tailings pond.The results show that there is a significant correlation between ^(238)U and ^(232)Th content,which is about 20—40 times of the soil background value in Jiangxi province.Concentrations of ^(238)U and ^(232)Th drop gradually and then remain stable with increase of distance from tailings pond.Geological accumulation index of ^(238)U and ^(232)Th in stream sediments is slightly higher than that in farmland soil.Farmland soil in T1 and T2 points are relatively close to tailings pond,so soil pollution is more serious,resulting in geological accumulation index is much higher than that of other points,presenting extremely heavy pollution.Medium or strong ecological risk of Er(^(238)U)and Er(^(232)Th)accounts for 50%.Therefore,the survey area shows overall moderate degree,local points shows serious pollution,it is suggested to take control measures in this area.
作者
高杨
高柏
蒋文波
张海阳
史天成
刘圣锋
方正
丁燕
GAO Yang;GAO Bai;JIANG Wen-bo;ZHANG Hai-yang;SHI Tian-cheng;LIU Sheng-feng;FANG Zheng;DING Yan(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2021年第8期145-150,共6页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(41162007、41362011)
江西省重点研发计划资助项目(2018ACG70023)。
