Acquisition of a CO2-Laser Fluorination System and a Mass Spectrometer System for Multiple Stable Isotope Analyses

EAR-0129793本合同为购买二氧化碳激光氟化系统和同位素比质谱仪系统提供部分支持(55%)，用于地质和环境样品的多种稳定同位素分析(如O，S和Amp；N)。这些设施将在路易斯安那州立大学(LSU)的地质和地球物理系安装和运行。此次收购将极大地改善路易斯安那州立大学现有的研究基础设施，并增强路易斯安那州立大学地球化学组目前和计划中的研究能力。此外，这些设施还为本科生提供了良好的科学教育和培训平台。首席研究员包惠明博士最近加入该系担任助理教授。这些仪器将是鲍康如在氧(所有三种同位素：16O、17O和Amp；18O)、硫(所有四种同位素：32S、33S、34S和Amp；36S)和氮(14N和Amp；15N)的多同位素地球化学研究项目中的主要工具。这些新仪器的能力将用于研究和教育活动，目的是更好地了解大气和地表环境中的元素循环。近期的研究计划包括研究南极干旱河谷土壤系统中硫酸盐和硝酸盐在大气中的长期沉积及其沉积后的迁移性(与波士顿大学的Marchant博士合作)，南非太古宙硫化物和硫酸盐矿床的氧和硫同位素组成，以及从现代和古代火山灰烬中淋滤出的硫酸盐，所有这些都将受益于二氧化碳激光氟化系统的可获得性，以及能够以最小样本量提供高效离线/在线气体提取和高精度多重同位素分析的IRMS。***

EAR-0129793BaoThis award provides partial support (55%) for the acquisition of a CO2-laser fluorination system and an isotope-ratio mass spectrometer (IRMS) system for multiple stable isotope analyses (e.g., O, S & N) for geological and environmental samples. These facilities will be installed and operated in the Department of Geology and Geophysics at the Louisiana State University (LSU). This acquisition will greatly improve LSU's existing research infrastructure and enhance current and planned research capabilities of the LSU geochemistry group. In addition, the facilities provide excellent science education and training platform for undergraduate students. The Principal Investigator (PI), Dr. Huiming Bao, recently joined the Department as an Assistant Professor. The instruments will be the primary tool for Bao's research programs in multiple isotope geochemistries of oxygen (all three isotopes: 16O, 17O, & 18O), sulfur (all 4 isotopes: 32S, 33S, 34S, & 36S), and nitrogen (14N & 15N). The capabilities of these new instruments will be used in research and educational activities aimed at a better understanding of elemental cycles in the atmosphere and in surface environments. Immediate research plans include studies of long-term atmospheric deposition of sulfate and nitrate and their post-depositional mobility in Antarctic Dry Valley soil systems (in collaborating with Dr. Marchant at Boston University), oxygen and sulfur isotopic compositions of Archean sulfide and sulfate deposits in South Africa, and sulfate leached from recent and ancient volcanic ashes, all of which will benefit from the availability of a CO2-laser fluorination system and an IRMS that can offer efficient off-line/on-line gas extractions and high-precision multiple isotopic analyses with minimal sample size. ***