Assessing background mercury deposition and emissions in Canada

评估加拿大的汞沉积和排放背景

• 批准号: 261718-2008
• 负责人: VanHeyst, Bill
• 金额: $ 1.76万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=426767
• 关键词: Assessing; background; mercury; deposition; emissions

Mercury is ubiquitous in the global environment, including sensitive receptors such as the Canadian Arctic, and is of concern due to its toxicity, persistence and ability to bio-accumulate and bio-magnify in various food chains. While some mercury is released into the environment through natural sources such as volcanoes, most of the mercury present in the environment can be attributed to man-made sources such as fossil fuel combustion, waste incineration, and metal processing. Once the mercury is released into the atmosphere, it undergoes a complex cycle involving transformations, atmospheric transport, and eventual deposition to terrestrial and aquatic surfaces. Under favourable weather conditions, the mercury can volatilize back into the atmosphere to undergo further long range transport and deposition cycles, thus making mercury a truly global pollutant.

汞在全球环境中无处不在，包括加拿大北极地区等敏感受体，由于其毒性、持久性以及在各种食物链中的生物积累和生物放大能力而令人担忧。 虽然有些汞是通过火山等自然来源释放到环境中的，但环境中存在的大部分汞可归因于人为来源，如化石燃料燃烧、废物焚烧和金属加工。 一旦汞被释放到大气中，它就会经历一个复杂的循环，包括转化、大气迁移和最终沉积到陆地和水生表面。 在有利的天气条件下，汞可以挥发回大气中，进行进一步的远距离传输和沉积循环，从而使汞成为真正的全球污染物。