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Assessing Risk and Dispersion Rate of Ionic Contaminants in Permafrost Terrain

评估永久冻土地区离子污染物的风险和扩散率

基本信息

批准号：
9979685
负责人：
Ronald Sletten
金额：
$ 33.8万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1999
资助国家：
美国
起止时间：
1999-09-15 至 2004-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9979685&HistoricalAwards=false
关键词：
Assessing Risk Dispersion Rate Ionic

项目摘要

This award in the Arctic Contaminants program is supported by the Office of Polar Programs, the Divisions of Chemistry and Earth Sciences, and the Math and Physical Sciences' Office of Multidisciplinary Activities. Dr. Ronald S. Sletten of the University of Washington will conduct the research in collaboration with Dr. Tom Pratum, also of the University of Washington, Dr. Steven Grant from the Cold Regions Research and Engineering Laboratory, and Dr. Thomas Osterkamp from the University of Alaska, Fairbanks. Together the research group has expertise in environmental and analytical chemistry, nuclear magnetic resonance (NMR) methodology, thermodynamic modeling, and ionic migration in frozen soils. The group will conduct laboratory and field studies and theoretical analysis of soils contaminated with ionic pollutants under subfreezing conditions. Using NMR pulsed-gradient techniques, they will assess diffusion rates on the molecular scale. The solutes under investigation include lithium, sodium, lead, cadmium and zinc chlorides, and calcium sulfate. Of particular interest is contaminant migration in permafrost areas, both in the continuously frozen subsurface and the annually thawing, surface active-layer. The expected result is improved fundamental understanding of the transport and fate of pollutants in cold terrestrial environments underlain by permafrost.

北极污染物计划的这一奖项得到了极地计划办公室，化学和地球科学部门以及数学和物理科学多学科活动办公室的支持。罗纳德·S.博士华盛顿大学的Sletten将与华盛顿大学的Tom Pratum博士、寒冷地区研究和工程实验室的Steven Grant博士以及阿拉斯加大学费尔班克斯的托马斯奥斯特坎普博士合作进行这项研究。该研究小组共同拥有环境和分析化学，核磁共振（NMR）方法，热力学建模和冻土中离子迁移的专业知识。该小组将进行实验室和实地研究，并对在冰点以下条件下受离子污染物污染的土壤进行理论分析。使用核磁共振脉冲梯度技术，他们将评估分子尺度上的扩散速率。研究中的溶质包括锂、钠、铅、镉和锌的氯化物以及硫酸钙。特别令人感兴趣的是污染物迁移在冻土区，无论是在连续冻结的地下和每年解冻，表面活性层。预期的结果是提高对污染物在永久冻土下的寒冷陆地环境中的迁移和归宿的基本认识。