Collaborative Research: Do CFCs and SF6 behave as reactive (sorbing) tracers in low carbon content sedimentary aquifers?

合作研究：CFC 和 SF6 在低碳含量沉积含水层中是否充当反应（吸附）示踪剂？

• 批准号: 0838408
• 负责人: Richelle Allen-King
• 金额: $ 21.17万
• 依托单位: SUNY at Buffalo
• 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: 2009-07-15 至 2013-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0838408&HistoricalAwards=false
• 关键词: Collaborative; Research; Do; CFCs; SF6

Collaborative Research: Do CFCs and SF6 behave as reactive (sorbing) tracers in low carbon content sedimentary aquifers?This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Intellectual Merit: CFCs and SF6 are environmental tracers used to date recent groundwater (up to ~50 years). Because these compounds are relatively soluble, the current paradigm expects conservative (no sorption or degradation) transport of these compounds in aerobic, low carbon content (foc) aquifers. We posit that CFCs and SF6 act as reactive (sorbing) tracers in many low foc sedimentary aquifers ? in particular those that contain thermally altered carbonaceous matter (TACM). TACM examples include char, coal and kerogen. TACM occurs commonly in sediments deposited since the Devonian. Our preliminary experiments demonstrate that CFC sorption is sufficient to significantly retard CFC transport in low foc aquifers. This project will provide the first systematic assessment of the impact of different forms of TACM on CFC and SF6 sorption. The experiments will be completed for selected low foc sediments over an unprecedented concentration range of ~9 orders of magnitude. CM will be fractionated, quantified and classified using established methods. The isotherm models and parameters deduced will be used to evaluate the conditions in which significant retardation of these solutes are expected in low foc aquifers. Broader Impacts: The proposed project will provide support for a new collaboration between Drs. Allen-King and Sheldon, faculty members at neighboring and complementary SUNY institutions: Geneseo, a primarily undergraduate institution, and Buffalo, a PhD granting institution. This project will enhance educational opportunities through direct support of four undergraduate students and one PhD student. It will provide opportunities to develop connections through student exchanges between the institutions. The PIs will invite applications from qualified students with particular attention to soliciting participation from members of underrepresented groups. Benefit to society from this project will come through improved understanding of the reactive transport of moderately hydrophobic chemicals in groundwater and improved groundwater age estimates. This project will support economic stimulus through providing well paid positions for research students and valuable training that will enhance their technical contributions as they enter the workforce.

合作研究：CFC和SF6 在低碳含量沉积含水层中表现为反应性（吸附）示踪剂？该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。知识价值：CFC和SF6是环境示踪剂，用于确定最近地下水的年代（长达50年）。由于这些化合物是相对可溶的，目前的范例预计保守的（无吸附或降解）运输这些化合物在有氧，低碳含量（FOC）含水层。我们认为CFCs和SF6 在许多低聚焦点的沉积含水层中作为反应（吸附）示踪剂？特别是含有热蚀变含碳物质（TACM）的那些。TACM实例包括炭、煤和油母质。TACM普遍存在于泥盆纪以来沉积的沉积物中。我们的初步实验表明，CFC的吸附是足够的，以显着延缓CFC运输在低foc含水层。该项目将首次系统评估不同形式的三氟甲烷对氟氯化碳和六氟化硫吸附的影响。实验将在前所未有的~9个数量级的浓度范围内对选定的低foc沉积物进行。CM将使用已建立的方法进行分级、定量和分类。推导出的等温线模型和参数将被用来评估这些溶质的显着延迟预计在低foc含水层的条件。更广泛的影响：拟议的项目将为艾伦-金博士和谢尔顿博士之间的新合作提供支持，他们是邻近和互补的纽约州立大学机构的教员：Geneseo，一个主要的本科院校，和布法罗，一个博士学位授予机构。该项目将通过直接支持四名本科生和一名博士生来增加教育机会。它将提供机会，通过机构之间的学生交流发展联系。PI将邀请合格的学生申请，特别注意吸引代表性不足的群体的成员参加。通过提高对地下水中中度疏水化学品的反应性迁移的理解和改进地下水年龄估计，该项目将给社会带来好处。该项目将通过为研究生提供高薪职位和有价值的培训来支持经济刺激，这些培训将在他们进入劳动力市场时提高他们的技术贡献。