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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

基本信息

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

项目摘要

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.

需要资金购买仪器，通过允许样品的逐渐溶解和流出物的连续分析，为微化石和碳酸盐矿物的分析提供传统批量溶解的替代方案。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。该提案提出了 FT-TRA 技术的两个初步应用，说明了所提出的仪器应用的多样性。 (1) 海洋微化石中的元素比率被用作过去环境条件的代理。与批量溶解微化石中测量的元素比率相关的一个重要问题是，海底的部分溶解、方解石过度生长以及各种矿物相的污染掩盖了记录目标信息的生物方解石的元素比率。所提出的仪器允许在微化石缓慢溶解和连续分析流出物时连续监测元素比率。结果，可以清楚地分离来自生物方解石的元素组成。 (2) 一些矿山废物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，才能实现这一好处。所需的仪器能够对结合二氧化碳的来源进行指纹识别，从而评估碳固定的净温室气体效益。