| 红枫湖沉积物~(137)Cs扩散迁移性研究员 | |
| 窦明晓 | |
| 1992 | |
| Degree Grantor | 中国科学院地球化学研究所 |
| Place of Conferral | 中国科学院地球化学研究所 |
| Degree Name | 博士 |
| Degree Discipline | 环境地球化学 |
| Keyword | 赋存形态 ~(137)Cs时标 界面过程 流域侵蚀 |
| Abstract | 保存在湖泊沉积物~(137)Cs剖面中的环境信息记录，可能因~(137)Cs沉积后的再迁移作用而失真。~(137)Cs吸附动力学及离子交换实验表明红枫湖沉积物中的~(137)Cs绝大部分处于固定态，少量处于交换态和造反性吸附态。同时Cs~（+）浓度很低时，高Cs~(+)浓度下在各吸附态与粘土矿物表面的特定吸附部位之间，通常比较明确的对应关系变得有些模糊。本文以界面过程的数学模型为核心，通过模式分析，重建了红枫湖地区历年的~(137)Cs大气沉降通量值，获得了红枫湖集水区 ~(137)Cs流域侵蚀寄宿时间，约为550年。 ~(137)Cs的扩散和其它沉积后再迁移作用。虽然导致~(137)Cs剖面发生了一些变化，但通过适当的数据处理，仍可从中提取出有价值环境信息。 |
| Other Abstract | The environmental message kept in the profile of ~(137)Cs in lake sediments could be changed by post-migration. Through experiments on sorption and ion-exchange of ~(137)Cs, we indicate that most of ~(137)Cs in Hong Feng Lake sediments stay in fixed state, only small part in exchangeable and preferable sorption state. In dilute solution, the three kind of sites in correspondence with above states at high concentration become more difficult to distinguish. Based on the mathematical modelling of water- sediment interface process, the flux of ~(137)Cs fallout data from 1980 to 1988 at Hong Feng Lake area are rebult, and the ~(137)Cs erosion rate are determined. We come to th conclusion that information may still be acquired, although the profile may be changed by processes such as diffusion through pore water, with proper data processing. )Cs~(137)Cs~(137)Cs~(137)Cs~(137)Cs ~(137)Cs ~(137)Cs ~(137)Cs ~(137)Cs |
| Pages | 79 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.gyig.ac.cn/handle/352002/3892 |
| Collection | 研究生_研究生_学位论文 |
| Recommended Citation GB/T 7714 | 窦明晓. 红枫湖沉积物~(137)Cs扩散迁移性研究员[D]. 中国科学院地球化学研究所. 中国科学院地球化学研究所,1992. |
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| File Name/Size | DocType | Version | Access | License | ||
| N88710.pdf（5798KB） | 暂不开放 | -- | Application Full Text | |||
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