秦山核电基地外围环境耕作层土壤中氚化水分布特征  

Distribution Characteristics of Tritiated Water in Cultivated Soil of Surrounding Environment of Qinshan Nuclear Power Base

作　　者：吴伟锋 冯瑜 郭锋[1] 申慧芳[2] WU Weifeng;FENG Yu;GUO Feng;SHEN Huifang(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;College of Arts and Sciences,Shanxi Agricultural University,Taigu 030801,China)

机构地区：[1]山西农业大学资源环境学院,山西太谷030801 [2]山西农业大学文理学院,山西太谷030801

出　　处：《山西农业科学》2020年第4期598-602,608,共6页Journal of Shanxi Agricultural Sciences

基　　金：国家自然科学基金项目(11575104)。

摘　　要：为了获取耕作层土壤中氚化水(HTO)浓度的分布特征,于秦山核电基地外围环境主导风向不同距离选取4个采样点,分别于2018年7、9、12月采集不同深度土层(0~5、5~10、10~15、15~20、20~25 cm)耕作土土壤样品,对不同土层土壤中HTO的浓度进行测定。结果表明,耕层土壤中HTO浓度的分布具有一定的季节性,7、9、12月所采集的0~25 cm土壤中HTO平均浓度范围分别为:(18.68±1.63)^(61.32±1.79)、(3.70±0.21)^(22.90±1.31)、(3.50±0.35)^(27.37±0.77)Bq/L;HTO浓度随土层深度的增加7月呈锯齿状变化,且各土层间差异显著,9月呈逐渐降低的趋势,12月则呈逐渐升高的趋势,9月和12月5 cm土层以下各土层差异不明显,7月和9月HTO浓度最大值和最小值分别出现在0~5 cm和15~20 cm土层,12月则恰好相反;耕层土壤中HTO的浓度随着到秦山三期距离的增加呈降低趋势,4个采样点0~25 cm耕层土壤中HTO的浓度7、9、12月采样的平均值分别为30.89、21.09、19.11、10.64 Bq/L;同一采样点耕作土壤中HTO的浓度随采样时间的推移呈降低趋势,4个采样点0~25 cm耕层土壤中HTO浓度平均值的最小值与最大值相比分别下降了77.12%、72.19%、88.36%和82.86%。在进行耕作土壤中HTO迁移的模拟和浓度评价时应充分考虑季节性变化。To obtain distribution different soil of tritiated water(HTO)concentration in the cultivated soil profile,the concentration of HTO was determined in cultivated soil samples with different soil depths layer(0-5,5-10,10-15,15-20,20-25 cm)from four sampling site located the downwind of the prevailing wind direction in the vicinity of Qinshan Nuclear Power Plant Base.The soil samples were collected in July,September and December 2018.The results showed that the means of the HTO concentrations in 0-25 cm soil profile in July,September and December were in the range of(18.68±1.63)-(61.32±1.79),(3.70±0.21)-(22.9±1.31),(3.50±0.35)-(27.37±0.77)Bq/L with a significant seasonal variation,respectively.In July,it showed the serrated character of HTO concentration distribution in soil layer of different depth with the increasing of depth,and there was a significant difference in the soil depth profile.In September,the HTO concentration gradually decreased,while in December,the HTO concentration gradually increased with the increase of depth.There were no apparent differences in HTO concentrations in July and December below a soil depth of 5 cm.In July and September,the maximum and minimum values of HTO concentration appeared in 0-5,15-20 cm soil layers,respectively,while the opposite trend was observed in December.The soil HTO concentrations decreased with increase of distance from the Third Qinshan Nuclear Power Plant.The mean values of HTO concentration in 0-25 cm soil depth layer of the four sampling sites were 30.89,21.09,19.11,10.64 Bq/L,respectively.The concentration of HTO in cultivated soil decreased with the sampling time at the same sampling point.For the mean value of HTO concentration in 0-25 cm soil depth of the four sampling points,the minimum value decreased by 77.12%,72.19%,88.36%and 82.86%compared with the maximum value,respectively.The findings suggest that seasonal variation should be fully considered in the simulation of HTO migration and HTO concentration evaluation for cultivated soil.

关 键 词：氚化水 耕作土 分布 土壤层 

分 类 号：X53[环境科学与工程—环境工程]