Geoenvironmental Influences on Raman Spectroscopic Monitoring of Chlorinated Solvents

地质环境对氯化溶剂拉曼光谱监测的影响

• 批准号: 0927112
• 负责人: Joseph Sinfield
• 金额: $ 15.13万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2012-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0927112&HistoricalAwards=false
• 关键词: Geoenvironmental; Influences; Raman; Spectroscopic; Monitoring

This award is funded under the American Recovery and Reinvestment Act of 2009(Public Law 111-5).This research addresses a multidisciplinary challenge at the intersection of sensing, environmental engineering and geotechnical engineering focused on obtaining valid and representative measurements of chlorinated solvents in the geoenvironment to facilitate cost-effective characterization, monitoring, and management strategies for sites contaminated with these compounds. These sites are subject to tremendous variability on multiple scales and frequently involve an array of additional chemicals. The technology currently available to assess chlorinated solvents at actionable levels involves costly and sophisticated instruments that can assess only select compounds, provide information over a limited spatial extent, and are available to relatively few. There is great potential to overcome this challenge and transform the state of field monitoring by taking advantage of recent technological advances in lasers, photonics, and telecommunications technology to deploy a distributed chlorinated solvent sensing system based on time-resolved Raman spectroscopy. Achieving this vision is a multi-stage effort, and hinges on establishing a fundamental understanding of the factors affecting in-situ Raman spectroscopic measurements. Thus, the objective of this effort is to assess geoenvironmental influences on time-resolved Raman scattering observations of chlorinated solvents under controlled laboratory conditions indicative of those likely to be present in the field. Specifically, the work will build upon a recently developed innovative prototype fiber-coupled, time-resolved, Raman spectroscopy system, to 1) methodically examine the impact of multi-compound backgrounds, fluorophores, and sample turbidity on Raman observations, 2) provide insight into data analysis algorithms required to effectively collect Raman signatures in the presence of fluorophores, and 3) develop recommendations for field use of time-resolved Raman scattering for chlorinated solvent investigations, and optical spectroscopic analyses more generally. Overall, progress toward optical spectroscopic monitoring systems that can be deployed at low cost over large areas, and yet provide specific analyses of a broad range of chemical compounds in nearly real-time will offer an unprecedented view of chemical fate and transport in the geoenvironment. More broadly, this work will advance a range of fields involving spectroscopic analyses of materials in complex, turbid, and/or fluorescence limited settings including water quality monitoring, precision agriculture, petroleum exploration, pharmaceutical quality control, analyses of biological systems, and assessment of homeland security threats and environmental disaster impact.

该奖项由 2009 年美国复苏和再投资法案（公法 111-5）资助。这项研究解决了传感、环境工程和岩土工程交叉领域的多学科挑战，重点是获得地质环境中氯化溶剂的有效且有代表性的测量结果，以促进对受这些化合物污染的场地进行经济高效的表征、监测和管理策略。 这些地点在多个尺度上都存在巨大的变化，并且经常涉及一系列额外的化学物质。 目前可用于评估可操作水平的氯化溶剂的技术涉及昂贵且复杂的仪器，这些仪器只能评估选定的化合物，在有限的空间范围内提供信息，并且可供相对少数人使用。 通过利用激光、光子学和电信技术的最新技术进步来部署基于时间分辨拉曼光谱的分布式氯化溶剂传感系统，克服这一挑战并改变现场监测状态的潜力巨大。 实现这一愿景需要多阶段的努力，并取决于对影响原位拉曼光谱测量的因素建立基本的了解。 因此，这项工作的目的是评估地质环境对受控实验室条件下氯化溶剂的时间分辨拉曼散射观测的影响，表明可能存在于现场。 具体来说，这项工作将建立在最近开发的创新原型光纤耦合、时间分辨拉曼光谱系统的基础上，以 1) 系统地检查多化合物背景、荧光团和样品浊度对拉曼观察的影响，2) 深入了解在荧光团存在的情况下有效收集拉曼特征所需的数据分析算法，以及 3) 为时间分辨的现场使用制定建议 用于氯化溶剂研究和更广泛的光学光谱分析的拉曼散射。 总体而言，光学光谱监测系统的进展可以以低成本在大范围内部署，并且可以近乎实时地对多种化合物进行具体分析，这将为地球环境中的化学归宿和迁移提供前所未有的视角。 更广泛地说，这项工作将推进一系列涉及复杂、浑浊和/或荧光受限环境中材料光谱分析的领域，包括水质监测、精准农业、石油勘探、药品质量控制、生物系统分析以及国土安全威胁和环境灾害影响评估。