中国典型柱样中239+240Pu的无峰分布与迁移模型

黄亚楠; 刘志勇; 管永精

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (2) : 902-912.

土壤污染与控制

中国典型柱样中^239+240Pu的无峰分布与迁移模型

黄亚楠^1,2, 刘志勇³, 管永精⁴

作者信息 +

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

HUANG Ya-nan^1,2, LIU Zhi-yong³, GUAN Yong-jing⁴

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文章历史 +

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+240Pu无峰分布的现象,并讨论了^239+240Pu无峰分布的成因.结果表明:土壤柱样中^239+240Pu的无峰分布主要有两种类型,第一种是^239+240Pu比活度随着深度递增,第二种是^239+240Pu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+240Pu的迁移行为时,表观对流速率与^239+240Pu最大值深度呈现正相关关系(n=45, R²=0.847).湖泊和海洋沉积柱样中^239+240Pu的无峰分布仅有一种类型:^239+240Pu比活度随着深度递减.同时,湖泊柱样沉积速率(n=35, R²=0.921)或海洋柱样中的最大表观对流速率(n=32, R²=0.949)与^239+240Pu最大值深度也呈现正相关关系.无峰分布柱样中^239+240Pu可交换态的最大表观对流速率(v_max)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+240Pu在柱样中的垂向分布特征.

Abstract

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+240Pu peakless distribution cores in soil, lakes, and marine environments, and discussed their causes of ^239+240Pu peakless distribution. The results show that there were two main types of peakless distribution of ^239+240Pu in soil core samples: one that the ^239+240Pu specific activity increased with depth, and the other that the ^239+240Pu specific activity decreased with depth; when using a Convection Dispersion Equation (CDE) model to simulate the migration behavior of ^239+240Pu in soil cores, the apparent convection rate showed a positive correlation with the ^239+240Pu maximum depth (n=45, R²=0.847). There was only one type of peakless distribution of ^239+240Pu in lake and ocean core samples: the ^239+240Pu specific activity decreased with depth. Meanwhile, the sedimentation rate of lake core samples (n=35, R²=0.921) or the maximum apparent convection rate of marine core samples (n=32, R²=0.949) also showed a positive correlation with the ^239+240Pu maximum depth. The maximum apparent convection rate of the exchangeable ^239+240Pu 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+240Pu in the core sample.

导出引用

黄亚楠, 刘志勇, 管永精. 中国典型柱样中^239+240Pu的无峰分布与迁移模型[J]. 中国环境科学. 2025, 45(2): 902-912

HUANG Ya-nan, LIU Zhi-yong, GUAN Yong-jing. Peakless distribution and migration model of ^239+240Pu in the typical Chinese core samples[J]. China Environmental Science. 2025, 45(2): 902-912

中图分类号： X142

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