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

合作研究：在低碳含量的沉积含水层中，氯氟烃和SF6是否起到反应性(吸附)示踪剂的作用？该奖项由《2009年美国复苏和再投资法案》(公法111-5)资助。知识价值：CFCs和SF6是环境示踪剂，用于测定现代地下水的年代(长达~50年)。由于这些化合物是相对易溶的，目前的范例预计这些化合物在好氧、低碳含量(Foc)含水层中的运输是保守的(没有吸附或降解)。我们假设CFCs和SF6在许多低FOC沉积含水层中作为反应性(吸附)示踪剂？尤其是那些含有热蚀变碳质(TACM)的碳化物。TACM的例子包括焦炭、煤和干酪根。TACM常见于泥盆纪以来沉积的沉积物中。我们的初步实验表明，在低FOC含水层中，氯氟化碳的吸附足以显著延缓氯氟化碳的运输。该项目将首次系统评估不同形式的三氯甲烷对氯氟化碳和六氟化硫吸收的影响。这些实验将对选定的低FOC沉积物进行，浓度范围史无前例，达到约9个数量级。将使用既定的方法对CM进行分级、量化和分类。所推导的等温线模型和参数将被用来评估这些溶质在低含水层中预计会出现显著滞留的条件。更广泛的影响：拟议的项目将支持艾伦-金博士和谢尔顿博士之间的新合作，他们是邻近和互补的纽约州立大学院校的教师：Geneseo主要是本科生院校，Buffalo是授予博士学位的机构。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，通过院校之间的学生交流建立联系。督导计划将邀请合资格的学生申请，并特别注意邀请代表人数不足的团体的成员参加。该项目给社会带来的好处将来自于更好地了解地下水中中等疏水性化学物质的反应迁移，以及改进地下水年龄估计。该项目将通过为研究生提供高薪职位和宝贵的培训来支持经济刺激，这些培训将在他们进入劳动力大军时提高他们的技术贡献。

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.