POWRE: Investigating the Impact of Vegetation on Transport and Fate of Methyl Tert-Butyl Ether (MTBE) in the Environment

POWRE：研究植被对环境中甲基叔丁基醚 (MTBE) 运输和归宿的影响

• 批准号: 9806228
• 负责人: Anu Ramaswami
• 金额: $ 8万
• 依托单位: University of Colorado at Denver-Downtown Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2001-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806228&HistoricalAwards=false
• 关键词: POWRE; Investigating; Impact; Vegetation; Transport

9806228 Ramaswami The objective of this research is to examine vegetation as a potentially important factor controlling transport and transformations of Methyl tert-butyl ether (MTBE) in the natural environment. While the gasoline additive MTBE has been effective in reducing air polluting emissions from automobiles, its presence has been detected in groundwater and surface waters across the nation. It is apparent that point source contamination does not explain the observations and that non-point deposition of atmospheric MTBE is suggested. Vegetation is thought to play a role in both the transport and the transformation of MTBE. It is the aim of this research to understand that role, with the following objectives: 1) examine potential vegetation-induced pathways for transfer of MTBE between the atmosphere and bodies of water, including the transpiration from groundwater to air, as well as foliar uptake of air-borne MTBE, 2) assess the fate of MTBE as it moves through the plant and determine enhanced microbial degradation of MTBE in the plant rhizosphere and 3) assess the above factors and incorporate them into mathematical models that describe the fate and transport of MTBE between the atmosphere and groundwater systems. The knowledge gained may be applied toward development of integrated models to describe the impact of MTBE on the environment and to the development of plant-based phytoremediation systems for groundwater treatment. This new line of inquiry for the PI draws on her work with Se phytoremediation and MTBE transport and provides the potential for her to become a leader in this area of research.

9806228 Ramaswami 这项研究的目的是检查植被作为控制自然环境中甲基叔丁基醚 (MTBE) 运输和转化的潜在重要因素。虽然汽油添加剂 MTBE 能够有效减少汽车的空气污染排放，但在全国各地的地下水和地表水中都检测到了它的存在。显然，点源污染并不能解释观测结果，建议大气 MTBE 存在非点沉积。植被被认为在 MTBE 的运输和转化中发挥着重要作用。本研究的目的是了解这一作用，其目标如下：1) 检查潜在的植被诱导的 MTBE 在大气和水体之间转移的途径，包括从地下水到空气的蒸腾作用，以及叶的吸收2) 评估 MTBE 在植物中移动时的命运，并确定植物根际中 MTBE 增强的微生物降解；3) 评估上述因素并将其纳入数学模型中，描述 MTBE 在大气和地下水系统之间的归宿和传输。获得的知识可用于开发综合模型来描述 MTBE 对环境的影响，并用于开发基于植物的地下水处理植物修复系统。 PI 的这一新研究方向借鉴了她在硒植物修复和 MTBE 运输方面的工作，并为她提供了成为该研究领域领导者的潜力。