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.

由于金属矿床越来越难以发现，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。在热液矿床的情况下，这些模型的开发在很大程度上取决于热力学数据的可用性，以评估在升高的温度和压力下含水金属络合物的稳定性。申请人在世界各地经营着为数不多的实验室之一，这些实验室进行生成这些热力学数据所需的实验。虽然金属形态的研究已经成功地进行了溶解度方法，这种方法的缺点是，它只能确定物种的热力学性质，这是在实验条件下占主导地位的事实。这种限制可以克服使用紫外可见分光光度法，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一方法，取得了相当大的成功，最近完成了对热液中稀土元素行为的第一次也是唯一一次全面研究，其结果现在广泛应用于地壳交代作用和核废料处置等各种专题的研究。该申请寻求资金以更换使用了十年的紫外可见分光光度计，该分光光度计由于光学系统的劣化而变得无法使用。新的紫外-可见分光光度计将具有更高的分辨率，从而可以生成上级热力学数据，并将首先用于调查钴、铀和锆的形态，这些研究将有助于改进这些矿床的矿石存款模型。更广泛地说，这些设备将使我们能够继续发挥重要作用，为科学界提供对模拟地壳流体中金属迁移至关重要的数据。