The Use of Stable Isotopes to Investigate Hydrocarbon- Contaminated Soils and Groundwaters

9631735 Poulson本提案是应环境地球化学和生物地球化学征集而提交的，美国国家科学基金会92-6。它由地球科学部、分子和细胞科学部以及EPSCoR办公室联合资助。拟议的研究将涉及使用稳定同位素作为一种潜在的技术，以调查地下危险有机化合物的来源和影响行为的过程。这项拟议的跨学科研究将结合地球化学和微生物成分，对甲苯的碳同位素体系进行实验研究。甲苯是危险场所检测到的五种更频繁的地下水污染物之一。这项研究将强调分级伴随的过程，如吸附、挥发、游离液相的溶解和微生物降解。稳定的同位素组成将使用气相色谱-燃烧-同位素比质谱仪进行监测。这项研究最终可能有助于确定和量化涉及这些有机化合物的自然过程，并有助于设计补救工作。

9631735 Poulson This proposal was submitted in response to the Environmental Geochemistry and Biogeochemistry solicitation, NSF 92-6. It is being jointly funded by the Earth Sciences Division, the Molecular and Cellular Sciences Division, and the EPSCoR office. The proposed research will involve the use of stable isotopes as a potential technique to investigate the sources and processes affecting behavior of hazardous organic compounds in the subsurface. The proposed interdisciplinary research will combine geochemical and microbiological components in an experimental investigation of the carbon isotope systematics of toluene, one of the five more frequently detected groundwater contaminants at hazardous sites. the research will emphasize fractionation accompanying processes such as adsorption, volatilization, dissolution of a free liquid phase, and microbial degradation. Stable isotope compositions will be monitored using gas chromatography - combustion - isotope ratio mass spectrometry. The research may ultimately contribute to approaches used to identify and quantify natural processes involving these organic compounds and also to engineer remediation efforts.