UV-visible spectrophotometer

紫外可见分光光度计

• 批准号: 374848-2009
• 负责人: WilliamsJones, Anthony
• 金额: $ 2.16万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=412028
• 关键词: UV; visible; spectrophotometer

As metallic mineral deposits have become more difficult to find, strategies for their exploration have become increasingly dependent on genetic models which quantitatively describe the mechanisms of metal transport and deposition. In the case of hydrothermal ore deposits, development of these models depends heavily on the availability of thermodynamic data with which to evaluate the stability of aqueous metallic complexes at elevated temperatures and pressures. The applicant runs one of a small number of laboratories around the world that conduct the experiments needed to generate these thermodynamic data. Although metal speciation studies have been conducted successfully using the solubility method, this approach suffers from the fact that it is only possible to determine the thermodynamic properties of species, which are predominant under the experimental conditions. This limitation can be overcome using UV-visible spectrophotometry, which allows simultaneous evaluation of the thermodynamic properties of multiple species involving a particular metal and ligand. The applicant has been using this approach with considerable success, and recently completed the first and only comprehensive study of the behaviour of the rare earth elements (REE) in hydrothermal fluids, results of which are now finding widespread application in studies of topics as diverse as the metasomatism of the crust and the disposal of nuclear waste. This application seeks funds to replace a ten year old UV-visible spectrophotometer which has become unusable because of deterioration of the optical system. The new UV-visible spectrophotometer will have improved resolution permitting the generation of superior thermodynamic data, and will be used initially to investigate the speciation of cobalt, uranium and zirconium, studies that will contribute to improved ore deposit models for these deposits. More generally, the equipment will allow us continue to play an important role in supplying the scientific community with data that are essential to modelling the transport of metals in crustal fluids.

随着金属矿藏的发现变得更加困难，其勘探战略越来越依赖于定量描述金属迁移和沉积机制的成因模型。对于热液矿床，这些模型的发展在很大程度上取决于热力学数据的可用性，用来评估水中金属络合物在高温和高压下的稳定性。申请者经营着世界上少数几个实验室中的一个，这些实验室进行产生这些热力学数据所需的实验。虽然用溶解度方法成功地进行了金属形态的研究，但这种方法的缺点是只能确定物种的热力学性质，而热力学性质在实验条件下是主要的。使用紫外可见分光光度法可以克服这一限制，它允许同时评估涉及特定金属和配体的多个物种的热力学性质。申请人一直在使用这种方法，取得了相当大的成功，最近完成了第一次也是唯一一次关于稀土元素在热液流体中行为的全面研究，其结果现在被广泛应用于从地壳交代作用到核废料处置等各种专题的研究。这项申请寻求资金，以更换由于光学系统恶化而无法使用的已有十年历史的紫外可见分光光度计。新的紫外可见分光光度计将具有更高的分辨率，从而能够产生更好的热力学数据，并将最初用于研究钴、铀和锆的形态，这些研究将有助于改进这些矿床的矿床模型。更广泛地说，这些设备将使我们能够继续发挥重要作用，向科学界提供对模拟地壳流体中的金属运输至关重要的数据。