Interfacial processes on mineral and rock surfaces: attenuation and release of contaminants and preservation of atmospheric processes

矿物和岩石表面的界面过程：污染物的衰减和释放以及大气过程的保存

• 批准号: 355232-2013
• 负责人: Schindler, Michael
• 金额: $ 1.97万
• 依托单位: Laurentian University of Sudbury
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572550
• 关键词: Interfacial; processes; mineral; rock; surfaces

The proposed research focuses on environmental processes at the solid-water and solid-atmosphere interfaces that affect the attenuation, release and preservation of metal(loid)s in the environment. Remediation and reclamation of contaminated soils and mine tailings sites is one of the highest environmental priorities in Canada. Remediation strategies commonly include the simultaneous use of fertilizers and lime. Surface coatings on mineral grains and organic material in these organic, phosphate and metal(loid)-rich soils and tailings facilities control (among other factors) the fate of metal(loid)s. The surfaces of grains and plant roots in these soils and tailings will be examined using a multi-analytical approach that can give us information about chemical processes at the nano- to micrometer scale in remediated soils and tailings. Coatings on exposed rocks are most commonly products of processes at the solid-atmosphere interface. Slow-growing rock coatings can be indicators of climatic change in the Pleistocene and Holocene, whereas coatings formed around smelters and other point sources are records of recent atmospheric pollution. A comparative study of coatings around smelters in Eastern Canada will give insight into the speciation and deposition rate of atmospheric species containing Mercury, Arsenic, Selenium, Lead, Copper, Nickel and Cadmium. Exposed bedrock and relative dry conditions in the Canadian Arctic suggest the widespread occurrence of rock coatings that could be used to deduce the origin and transport paths of atmospheric pollutants to the North. The study of coatings on Melville Island and proximal to the Raglan mine, Northern Quebec will give us an idea whether rock coatings in the Canadian Arctic can be used as indicators for temperature variation and atmospheric pollution.

本研究的重点是固体-水和固体-大气界面的环境过程对环境中金属（样物质）的衰减、释放和保存的影响。