Acquisition of an X-ray Diffractometer for Mineralogical and Sedimentological Studies

[0824729]该提案寻求资金购买一台x射线衍射仪，以取代佛罗里达大学地质科学系目前使用了30年的旧型号。目前的仪器在衍射图样中存在质量和精度的损失，并且不再得到制造商的支持。拟收购的是Rigaku Ultima IV垂直测角仪粉末x射线装置。该单元提供交叉光束光学，支持传统聚焦和平行光束衍射，允许分析具有不同几何形状的样品。所要求的系统具有完整的软件和自动化功能。XRD是矿物学、沉积学和岩石学研究的常用技术。研究小组将把该仪器投入使用，以1)了解非均质沉积物和岩石样品的矿物学，2)评估控制表面岩石物理化学行为的沸石、粘土和阴离子盐的稳定性，3)了解非定形和结晶固体中埃至纳米尺度孔隙中的水的物理性质，4)定义海洋、河口和陆地系统中的水-岩相互作用。5)了解沿海系统中海底地下水排放的生物地球化学影响，6)了解与晚新生代北半球冰川作用相关的全球沉积增加，7)通过研究现代受影响环境和古河口环境中的沉积过程来了解沿海城市化，以及8)更好地了解森林砍伐等人类影响。土壤侵蚀和土地利用变化对流域沉积学的影响。管理计划由pi管理升级和维护。实验室空间是通过部门分配的，国家支持的非终身教职员工将提供技术支持。架空支持将提供电气和冷却要求。收取少量酬金（内部用户每小时5-10元，外部用户每小时40元），以支持定期维修。目前，出于安全考虑，学生没有接受XRPD的实践培训。拟议的仪器将提供给进行研究的学生，并在本科和研究生课程中使用：矿物学、岩石学、沉积学和地球化学。该仪器将用于外展，如佛罗里达学者？该项目面向高中学生和K-12教师。pi还将在同行评议的论文中发表数据

0824729NeuhoffThis proposal seeks funding to purchase an X-ray diffractometer to replace a current 30-year old model within the Department of Geological Sciences at the University of Florida. The current instrument suffers from loss of quality and accuracy in the diffraction pattern and is no longer supported by the manufacturer. The proposed acquisition is a Rigaku Ultima IV vertical goniometer powder X-ray unit. This unit is supplied with cross-beam optics which support both traditional focusing and parallel beam diffraction allowing analysis of samples with varying geometry. The requested system is complete with software and automation capabilities. XRD is a common technique for studies in mineralogy, sedimentology and petrology. The research team will put the requested instrument into service to 1) understanding the mineralogy of heterogeneous sediment and rock samples, 2) assessing the stability of zeolites, clays, and anion salts which control the physicochemical behavior of surface rocks, 3) understanding the physical properties of water in angstrom to nanometer scale pores within amorphous and crystalline solids, 4) defining water-rock interactions in marine, estuarine and terrestrial systems ? with focus on aquifier rocks and sediments during groundwater-surface exchange, 5) understanding biogeochemical impacts of submarine groundwater discharge in coastal systems, 6) understanding the global sedimentation increase associated with the late Cenozoic Northern Hemisphere glaciation, 7) understanding coastal urbanization through studying sedimentation processes in modern impacted and paleo-estuarine environments, and 8) to better understand human impacts such as deforestation, soil erosion, and land-use changes on watershed sedimentology. The management plan has the PIs administering the upgrade and maintenance. Laboratory space is allocated through the department and a state-supported non-tenure track faculty member will provide technical support. Overhead support will provide electrical and cooling requirements. A small remuneration ($5-10 per hour in-house and ~$40 per hour for outside users) will be collected to support periodic maintenance. Currently, students are not provided hands-on training in XRPD due to safety concerns. The proposed instrument will be made available to students performing research and also used classes in the undergraduate and graduate curriculum: mineralogy, petrology, sedimentology, and geochemistry. The instrument is to be used in outreach such as the Florida Scholar?s program, targeting high school students and K-12 teachers. PIs will also publish data in peer-reviewed papers.***