中国典型柱样中^(239+240)Pu的无峰分布与迁移模型  

Peakless distribution and migration model of^(239+240)Pu in the typical Chinese core samples

作　　者：黄亚楠 刘志勇[3] 管永精[4] HUANG Ya-nan;LIU Zhi-yong;GUAN Yong-jing(School of Environment and Life sciences,Nanning Normal University,Nanning 530001,China;School of Marine Sciences,Sun Yat-sen University,Zhuhai 519082,China;School of Radiation Medicine and protection,Soochow University,Suzhou 215123,China;School of Physical Science and Technology,Guangxi University,Nanning 530004,China)

机构地区：[1]南宁师范大学环境与生命科学学院,广西南宁530001 [2]中山大学海洋科学学院,广东珠海519082 [3]苏州大学放射医学与防护学院,江苏苏州215123 [4]广西大学物理科学与工程技术学院,广西南宁530004

出　　处：《中国环境科学》2025年第2期902-912,共11页China Environmental Science

基　　金：南宁师范大学博士科研启动项目(602021239517)。

摘　　要：根据中国45根土壤柱样、35根湖泊柱样和32根海洋柱样数据,发现土壤、湖泊和海洋环境中普遍存在一类典型的^(239+240)Pu无峰分布的现象,并讨论了^(239+240)Pu无峰分布的成因.结果表明:土壤柱样中^(239+240)Pu的无峰分布主要有两种类型,第一种是^(239+240)Pu比活度随着深度递增,第二种是^(239+240)Pu比活度随着深度递减;利用对流扩散方程(CDE)模型模拟土壤柱样中^(239+240)Pu的迁移行为时,表观对流速率与^(239+240)Pu最大值深度呈现正相关关系(n=45,R^(2)=0.847).湖泊和海洋沉积柱样中^(239+240)Pu的无峰分布仅有一种类型:^(239+240)Pu比活度随着深度递减.同时,湖泊柱样沉积速率(n=35,R^(2)=0.921)或海洋柱样中的最大表观对流速率(n=32,R^(2)=0.949)与^(239+240)Pu最大值深度也呈现正相关关系.无峰分布柱样中^(239+240)Pu可交换态的最大表观对流速率(vmax)在数值上与沉积速率(v)相当,并且最大表观对流速率不影响^(239+240)Pu在柱样中的垂向分布特征.Based on data from 45 soil cores,35 lake sediment cores,and 32 sea sediment cores in China,this study found a type of^(239+240)Pu peakless distribution cores in soil,lakes,and marine environments,and discussed their causes of^(239+240)Pu peakless distribution.The results show that there were two main types of peakless distribution of^(239+240)Pu in soil core samples:one that the^(239+240)Pu specific activity increased with depth,and the other that the^(239+240)Pu specific activity decreased with depth;when using a Convection Dispersion Equation(CDE)model to simulate the migration behavior of^(239+240)Pu in soil cores,the apparent convection rate showed a positive correlation with the^(239+240)Pu maximum depth(n=45,R^(2)=0.847).There was only one type of peakless distribution of^(239+240)Pu in lake and ocean core samples:the^(239+240)Pu specific activity decreased with depth.Meanwhile,the sedimentation rate of lake core samples(n=35,R^(2)=0.921)or the maximum apparent convection rate of marine core samples(n=32,R^(2)=0.949)also showed a positive correlation with the^(239+240)Pu maximum depth.The maximum apparent convection rate of the exchangeable^(239+240)Pu in the peakless distribution core sample was close to the sedimentation rate,and the maximum apparent convection rate didn’t affect the vertical distribution of^(239+240)Pu in the core sample.

关 键 词：^(239+240)Pu 无峰分布 对流扩散方程(CDE) 柱样 中国 

分 类 号：X142[环境科学与工程—环境科学]