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

0824729 Neuhoff这项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已有30年历史的型号。目前的仪器在衍射图案上存在质量和精度方面的损失，不再受到制造商的支持。拟议的收购是Rigaku Ultima IV垂直测角仪粉末X射线装置。该装置配有交叉光束光学元件，支持传统聚焦和平行光束衍射，允许分析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能力。X射线衍射仪是矿物学、沉积学和岩石学研究中的一种常用技术。研究小组将使用所要求的仪器来1)了解非均质沉积物和岩石样品的矿物学，2)评估控制表层岩石物理化学行为的沸石、粘土和阴离子盐的稳定性，3)了解水的物理性质，从无定形和结晶固体中的纳米级孔隙，4)定义海洋、河口和陆地系统中的水-岩石相互作用？5)了解海底地下水排放对沿海系统的生物地球化学影响，6)了解与晚新生代北半球冰川有关的全球沉积增加，7)通过研究现代受影响和古河口环境中的沉积过程来了解沿海城市化，以及8)更好地了解人类影响，如森林砍伐、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。实验室空间通过系分配，一名国家支持的非终身教职教职员工将提供技术支持。高架支架将提供电气和冷却要求。将收取少量报酬(内部人员每小时5-10美元，外部用户每小时40美元)，以支持定期维护。目前，出于安全考虑，XRPD没有为学生提供实践培训。拟议的仪器将提供给进行研究的学生，并用于本科生和研究生课程：矿物学、岩石学、沉积学和地球化学。该仪器将用于推广活动，如佛罗里达州学者S计划，目标是高中生和K-12教师。PIS还将在同行评议的论文中发布数据。*

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.***