Potentiometric Autotitration System for Characterizing Reactivity of Environmental Samples

用于表征环境样品反应性的电位自动滴定系统

• 批准号: RTI-2016-00335
• 负责人: Konhauser, Kurt
• 金额: $ 3.39万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=591414
• 关键词: Potentiometric; Autotitration; System; Characterizing; Reactivity

Potentiometric titrations are critical in quantifying the surface reactivity of environmental surfaces, such as microbes, minerals, and organic compounds, with the ultimate aim of being able to predict the ability of those surfaces to sorb a range of trace and heavy metals from water. In this NSERC RTI application, we request a state-of-the-art autotitration system, to be housed in a new joint Konhauser-Alessi Geobiology laboratory at the University of Alberta (UofA). At present, our two research groups depend on one aging (13-year old) titrator. This instrument has been key in generating data for a number of previous and on-going research projects, including: (i) quantifying the accumulation of trace metals by marine plankton, and determining what role they might have played in Precambrian ocean nutrient cycling and banded iron formation sedimentation, (ii) evaluating the ability of clays and iron-bearing minerals to bind dissolved/particulate organic carbon (DOC/POC) and trace metals from seawater, (iii) determining whether DOC can compete with microbes in trace metal adsorption, (iv) assessing the ability of activated carbon, biochar, and petroleum coke to sequester toxic metal contaminants from mining and landfill sites, and (v) working in partnership with AREVA Resources Canada to characterize tailings sediment and pond waters from the decommissioned Cluff Lake uranium mine in Saskatchewan with the aim of developing a cost effective and efficient bioremediation process. Despite the promise potentiometric titrations hold for both environmental and applied industry research, several limitations exist with our existing instrument, namely: (1) it is overtaxed and students often wait weeks to perform routine analyses, (2) the minimum volumes of acid/base added to solutions by the instrument are too large for titrating small-volume suspensions, such as those of nanominerals, (3) it cannot perform forward (base) and reverse (acid) titrations without a time-consuming and error inducing reconfiguration of the entire instrument, and (4) it cannot perform conductometric titrations (or others, such as redox or Karl Fisher titrations). Moreover, with the continued growth of our joint laboratories, we currently have 12 HQP that use this equipment, making it impractical to continue this promising line of research without a modern titration system. In addition to our own needs, we will also continue to provide training and access to other research groups at the UofA who have previously used the existing titrator, including Drs. Gingras (EAS), Owttrim (BioSci), Gibbs-Davis (Chemistry), Perez and Liu (Civil Engineering). Accordingly, the purchase of a new state-of-the-art titration system provides not only our lab group, but also the UofA, with tremendous potential to increase efficiency, productivity, and support a number of HQP and NSERC supported research programs.

电位测量滴定对于量化环境表面的表面反应性至关重要，例如微生物，矿物质和有机化合物，其最终目的是能够预测这些表面能够从水中获得一系列痕量和重金属的能力。在此NSERC RTI应用程序中，我们要求将最先进的自动竞争系统安置在艾伯塔大学（UOFA）的新的Konhauser-Alessi Geobiology实验室中。目前，我们的两个研究小组取决于一个老年人（13岁）滴定器。 This instrument has been key in generating data for a number of previous and on-going research projects, including: (i) quantifying the accumulation of trace metals by marine plankton, and determining what role they might have played in Precambrian ocean nutrient cycling and banded iron formation sedimentation, (ii) evaluating the ability of clays and iron-bearing minerals to bind dissolved/particulate organic carbon (DOC/POC) and trace metals from seawater, (iii) determining whether DOC can compete with microbes in trace metal adsorption, (iv) assessing the ability of activated carbon, biochar, and petroleum coke to sequester toxic metal contaminants from mining and landfill sites, and (v) working in partnership with AREVA Resources Canada to characterize tailings sediment and pond waters from the decommissioned Cluff Lake uranium mine in Saskatchewan目的是开发一个具有成本效益有效的生物修复过程。 Despite the promise potentiometric titrations hold for both environmental and applied industry research, several limitations exist with our existing instrument, namely: (1) it is overtaxed and students often wait weeks to perform routine analyses, (2) the minimum volumes of acid/base added to solutions by the instrument are too large for titrating small-volume suspensions, such as those of nanominerals, (3) it cannot perform forward (base) and reverse (acid)滴定没有耗时和误差引起整个仪器的重新配置，并且（4）它无法执行导电滴定（或其他，例如氧化还原或Karl Fisher滴定）。此外，随着联合实验室的持续增长，我们目前有12个HQP使用此设备，这使得在没有现代滴定系统的情况下继续这一有前途的研究线是不切实际的。除了我们自己的需求之外，我们还将继续向以前使用过现有滴定器（包括​​Drs）的UOFA的其他研究小组提供培训和访问权限。 Gingras（EAS），Owttrim（Biosci），Gibbs-Davis（化学），Perez和Liu（土木工程）。因此，购买新的最先进的滴定系统不仅提供了我们的实验室组，而且还提供了UOFA，具有提高效率，生产率并支持许多HQP和NSERC支持的研究计划的巨大潜力。