摘要
利用等离子体质谱仪测定了华东某铀矿区和对照区共169个水稻土样品中放射性核素铀的含量,并采用单因子指数法对水稻土中放射性核素铀污染状况进行了评价。结果表明:(1)与江西省、全国土壤铀背景值和对照区铀含量平均值相比较,整个矿区水稻土中铀的平均含量分别是的6.07倍、8.82倍和11.18倍,正在采矿区分别为7.11倍、10.33倍和13.10倍;含矿未采区分别为1.37倍、1.99倍和2.52倍。(2)正在采矿区土壤中铀含量变异系数高达217.36%,表明受到人为扰动因素的强烈影响。(3)正在采矿区内水稻土铀含量是含矿未采区的5.20倍,说明采矿活动是矿区水稻土铀污染加剧的重要原因。(4)水稻土铀污染的强弱顺序为正在采矿区>整个矿区>含矿未采区>对照区,正在采矿区和整个矿区的水稻土属于重度放射性核素铀污染,含矿未采区的水稻土属于轻微铀污染,对照区未受铀污染。
To assessment the radioactive element uranium in paddy soil of the uranium mine region, east of China,total 169 paddy soil samples,which were distinguished as three groups(exploiting area, unexploited deposit area and comparison area without uranium deposit) according to the different sampling location, were collected and the radioactive element uranium contents in paddy soils were measured by ICP-MS. The pollution levels of paddy soils were comprehensively analyzed and assessed by using the methods of Single Factor Index. The results show that:(1)Uranium concentrations in paddy soils range in mg/kg: 1.44-416.00 for the exploiting area, 3.04-8.08 for the unexploited deposit area and 2.10-3.07 for the comparison area. Comparing with the average uranium concentrations of the comparison area, the soil uranium element background values of Jiangxi province and China, the average uranium concentrations in paddy soils of the whole uranium deposit area were11.18, 6.07 and 8.82; that of exploiting area were13.10, 7.11 and 10.33 times respectively; and that of unexploited deposit area were 2.52, 1.37 and 1.99 times respectively.(2) The variable coefficient of average uranium concentrations in paddy soil of the exploiting area was up to 217.36%. Which means it was influenced strongly by human factors.(3) The average uranium concentrations in paddy soils of the exploiting area were 5.20 times comparing with that of unexploited deposit area. The results showed that paddy soils of the exploiting area were considerably polluted by mining activities.(4) The assessment results showed that the uranium contamination levels in paddy soils of exploiting area was the highest, followed by that of whole uranium deposit area, that of unexploited deposit area was the third level, and that of comparison area was the lowest. The results suggested that paddy soils were 'severely' contaminated by uranium in the exploiting area and whole uranium deposit area, 'slightly' in the unexploited deposit area and 'unpolluted' in comparison area.
出处
《土壤通报》
CAS
CSCD
北大核心
2014年第6期1517-1521,共5页
Chinese Journal of Soil Science
基金
国家自然科学基金(41261081)
江西省自然科学基金(2011ZBAB203009)资助
关键词
水稻土
铀污染
放射性核素
污染评价
铀矿区
Paddy soil
Uranium contamination
Radionuclide element
Contamination Assessment
Uranium deposit area
