Purpose-built continuous leaching module for time-resolved mineral phase analysis

用于时间分辨矿物相分析的专用连续浸出模块

• 批准号: 374751-2009
• 负责人: François, Roger
• 金额: $ 5.68万
• 依托单位: University of British Columbia
• 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=412003
• 关键词: Purpose; built; continuous; leaching; module

Funding is requested to acquire instrumentation that provides an alternative to conventional batch dissolution for the analysis of microfossils and carbonate minerals by allowing for the gradual dissolution of samples and continuous analysis of the effluent. The key benefit of this dissolution technique (flow-through time-resolved analysis, FT-TRA) is the ability to differentiate between different mineral phases over the course of a dissolution experiment. Two initial applications of the FT-TRA technique are put forward in the proposal, illustrating the diversity of applications for the proposed instrumentation. (1) Elemental ratios in marine microfossils are used as a proxy for past environmental conditions. A significant problem associated with elemental ratios measured in batch-dissolved microfossils is that partial dissolution on the seafloor, calcite overgrowth, and contamination by various mineral phases obscure the elemental ratios of the biogenic calcite that record the targeted information. The proposed instrumentation allow for continuous monitoring of the elemental ratios as the microfossils are slowly dissolved and the effluent continuously analyzed. As a result, the elemental composition from the biogenic calcite can be clearly isolated. (2) Some mine wastes trap the greenhouse gas carbon dioxide, thus providing an environmental benefit. However, this benefit is only realized if the trapped carbon is derived from the atmosphere. The requested instrumentation enables the fingerprinting of the origin of bound carbon dioxide, thus assessing the net greenhouse gas benefit of carbon fixation.

要求提供资金，以购置仪器，取代分析微化石和碳酸盐矿物的传统分批溶解方法，使样品逐渐溶解，并对流出物进行连续分析。这种溶解技术（流通时间分辨分析，FT-TRA）的主要优点是能够在溶解实验过程中区分不同的矿物相。FT-TRA技术的两个初步应用中提出的建议，说明所提出的仪器应用的多样性。(1)海洋微体化石中的元素比率被用作过去环境条件的替代。一个显着的问题与元素比测定批量溶解微体化石是，部分溶解在海底，方解石过度生长，和污染的各种矿物相模糊的生物成因的方解石记录的目标信息的元素比。拟议的仪器允许连续监测元素的比例，因为微体化石缓慢溶解，并连续分析流出物。因此，可以清楚地分离出生物成因方解石的元素组成。(2)一些矿山废物能捕获温室气体二氧化碳，从而提供环境效益。然而，只有当捕获的碳来自大气时，这种好处才能实现。所要求的仪器能够确定结合二氧化碳的来源，从而评估碳固定的净温室气体效益。