Acquisition and Upgrade of Research Equipment at Oxy-Anion Stable Isotope Consortium at Louisiana State University

路易斯安那州立大学氧阴离子稳定同位素联盟研究设备的采购和升级

• 批准号: 1312284
• 负责人: Huiming Bao
• 金额: $ 37.54万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1312284&HistoricalAwards=false
• 关键词: Acquisition; Upgrade; Research; Equipment; Oxy

This grant supports acquisition of the following pieces of equipment to be added to the Oxy-Anion Stable Isotope Consortium (OASIC) at Louisiana State University (LSU): (1) An isotope-ratio mass spectrometer (IRMS); (2) optical replacement parts for an existing CO2-laser system; (3) A CRDS water isotope analyzer; (4) A thermogravimetric analyzer (TGA); and (5) a Gas Chromatograph (GC). The IRMS will be used mainly for ä34S measurement of sulfate and sulfide samples. The optical parts are replacing a clouded window. The CRDS, TGA, and GC are three critically missing pieces of equipment in the laboratory.Over the years, PI and his students have developed new wet chemistry methods and new extraction techniques that have opened up several research frontiers, including (1) Sulfate non-mass-dependent (NMD) depletion of the isotope 17O in the immediate aftermath of the global Marinoan glaciation at ~635 million years ago (funded by NSF Geobiology & Low-Temperature Geochemistry and NASA Astrobiology); (2) Sulfate NMD enrichment of the isotope 17O in volcanic ash beds in Cenozoic North America (funded by NSF Petrology & Geochemistry); (3) The discovery of NMD enrichment of the isotope 17O in natural perchlorate; and (4) NMD behaviors for rarefied gases (O2 and SF6) under a thermal gradient. Recently, OASIC?s capacity has been increasingly constrained due to equipment aging and lack of some of the essential instruments. The requested addition will allow the PI and graduate students to expand and test several new ideas in (1) non-mass-dependent stable isotope geochemistry, (2) isotope fractionation kinetics (e.g. incorporation and elimination or O2 signal in sulfate), and (3) mineral-gas oxygen isotope behaviors related to material and energy sciences, a new campus-wide LSU initiative. The upgrade will (1) enhance hands-on and interdisciplinary training of culturally and ethnically diverse postdoctoral researchers, graduate and undergraduate students, through supervised installation, self-maintenance, operation, and repair, and through collaboration with researchers around the world; (2) fill in a critical infrastructure need at the interface of geology, material science & engineering, and coastal studies within LSU research community; and (3) establish LSU OASIC as the go-to place for a leading-edge stable isotope laboratory in the South.

这笔赠款支持购买以下设备，添加到路易斯安那州立大学 (LSU) 的氧阴离子稳定同位素联盟 (OASIC)：(1) 同位素比质谱仪 (IRMS)；(2) 光学替代品；现有 CO2 激光系统的部件；(3) CRDS 水同位素分析仪；(4) 热重分析仪 (TGA)；以及 (5) 气相色谱仪(GC)。IRMS 将主要用于硫酸盐和硫化物样品的 ä34S 测量，光学部件正在取代 CRDS、TGA 和 GC 是实验室中严重缺失的三个设备。 PI 和他的学生开发了新的湿化学方法和新的提取技术，开辟了多个研究前沿，包括 (1) 同位素的硫酸盐非质量依赖性 (NMD) 消耗（2）北美新生代火山灰层中同位素17O的硫酸盐NMD富集（（3）同位素NMD富集的发现天然高氯酸盐中的 17O；以及 (4) 热梯度下稀薄气体（O2 和 SF6）的 NMD 行为 最近，由于设备老化和缺乏一些必需的仪器，OASIC 的能力日益受到限制。将允许 PI 和研究生扩展和测试以下方面的几个新想法：(1) 非质量依赖的稳定同位素地球化学，(2) 同位素分馏动力学（例如并入(3) 与材料和能源科学相关的矿物气体氧同位素行为，这是路易斯安那州立大学的一项新校园计划。此次升级将 (1) 加强文化方面的实践和跨学科培训，(2) 满足关键的基础设施需求。在地质学、材料科学和路易斯安那州立大学研究界内的工程和沿海研究；(3) 将路易斯安那州立大学 OASIC 建立为南方领先的稳定同位素实验室的首选地点。