Association of Plutonium isotopes with natural soil particles of different size and comparison with 137(CS)
Association of Plutonium isotopes with natural soil particles of different size and comparison with 137(CS)
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钚同位素与不同粒径天然土壤颗粒的缔合及与137(CS)的比较
DOI：
10.1016/j.scitotenv2016.12.162
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发表时间：
2017
影响因子：
9.8
通讯作者：
Hao Yongpei
中科院分区：
文献类型：
--
作者：
Xu Yihong;Pan Shaoming;Wu Mengmeng;Zhang Kexin;Hao Yongpei
关于钚(Pu)同位素如何与不同大小的天然土壤颗粒结合的信息，对于解释钚同位素作为土壤侵蚀示踪剂的应用是非常重要的。本工作研究了钚同位素与不同粒度的天然土壤的结合，并与~(137)Cs的结合进行了比较。采用湿法筛分和离心法相结合的方法，将采集自两个不同地区的10个土样分成不同粒度的土样，并对其中的137Cs、239Pu和240Pu进行了分析。结果表明，土壤中~(239)C+、~(240)Pu和~(137)Cs的浓度均随颗粒尺寸的减小而增大，并与土壤颗粒的比表面积密切相关，表明Pu与土壤颗粒~(137)Cs具有相似的优势结合。土壤组分中239C+、240Pu/137Cs的活度比随着颗粒大小的增大而增大，进一步表明与137Cs相比，细颗粒Pu对土壤中Pu的迁移不那么有利。这些结果不仅突出了钚同位素作为土壤侵蚀示踪剂的适宜性，而且为评价钚在污染环境中的迁移行为提供了有用的信息。
Information on how plutonium (Pu) isotopes associate with natural soil particles of different size is very important for the interpretation involved in the application of Pu isotopes as soil erosion tracers. This work investigated the association of Pu isotopes with different particle size fractions of natural soils and compared it with that of137Cs. Ten bulk soils collected from two different areas were separated into different particle size fractions by a combination of wet sieving and centrifugation techniques and the sub-samples were analyzed for137Cs,239Pu and240Pu. Results showed that the concentrations of both239 + 240Pu and137Cs increase with decreased particle sizes and are closely related to the specific surface areas of soil particles, which demonstrated a similar preferential association of Pu with finer soil particles as137Cs. The activity ratios of239 + 240Pu/137Cs in soil fractions increasing with increased particle size further indicated a less preferential transport of Pu with fine particles compared to137Cs. These results not only highlight the suitability of Pu isotopes as soil erosion tracers, but also provide useful information for assessing the migration behavior of Pu in contaminated environments.