Acquisition of Advanced Equipment for Measurement of Metal Speciation in Fresh Waters

购置用于测量淡水中金属形态的先进设备

• 批准号: 0132428
• 负责人: Gaboury Benoit
• 金额: $ 5.56万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-03-01 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0132428&HistoricalAwards=false
• 关键词: Acquisition; Advanced; Equipment; Measurement; Metal

0132428BenoitThis grant provides support for the acquisition of a Brinkmann automated voltammetry system (VA Trace Analyzer, Model 746) and a MARS 5 microwave digestion system (CEM Corp.) to facilitate measurement of rapid changes in chemical speciation that occur in freshwater systems as a result of both natural biogeochemical processes and point and nonpoint source pollution. The Brinkmann voltammetry system automates basic voltammetric functions and combines this ability with an automatic titration system and 80 position autosampler. The MARS 5 Microwave Digestion system is able to digest colloids and particles in multiple samples rapidly and completely, and has the unique ability to increase analyte concentration through evaporation of the digestion matrix. The information on total metal concentrations provided by analysis of digested samples is a necessary component in the process of evaluating chemical speciation. The increased sample processing efficiency and reproducibility of the MARS 5 microwave digestion system will complement the increased sample throughput of the Brinkmann automated voltammetry system in improving the ability of researchers in our laboratory to measure rapid changes in metal speciation within freshwater systems. Current research on metal complexation by NOM (natural organic matter) aims to identify easily measurable characteristics of NOM (e.g., spectroscopic) that can be used to estimate their complexation characteristics (abundance and strength of binding sites). Future work on NOM will evaluate rapid variations in quantity and quality that occur during storm events and with changing water flowpaths through soils. Other projects study metal binding by reduced sulfur compounds in fully-oxygenated surface waters. This newly discovered class of ligands is poorly understood, but may be as important as NOM in many instances. ***

0132428Benoit这笔赠款用于支持购买Brinkmann自动伏安法系统（VA痕量分析仪，746型）和MARS 5微波消解系统（CEM Corp.）促进测量淡水系统中由于自然生态地球化学过程以及点源和非点源污染而发生的化学形态的迅速变化。 Brinkmann伏安法系统自动执行基本伏安法功能，并将此功能与自动滴定系统和80位自动进样器相结合。 MARS 5微波消解系统能够快速、完全地消解多个样品中的胶体和颗粒，并具有通过消解基质蒸发提高分析物浓度的独特能力。 通过分析消化样品提供的总金属浓度信息是评价化学形态过程中的一个必要组成部分。 MARS 5微波消解系统提高的样品处理效率和重现性将补充Brinkmann自动伏安法系统提高的样品通量，提高我们实验室研究人员测量淡水系统中金属形态快速变化的能力。 目前对NOM（天然有机物）的金属络合的研究旨在鉴定NOM的容易测量的特征（例如，光谱），其可用于估计它们的络合特性（结合位点的丰度和强度）。 未来的NOM工作将评估在风暴事件期间以及随着土壤中水流路径的变化而发生的数量和质量的快速变化。 其他项目研究在完全氧化的表面沃茨中通过还原硫化合物的金属结合。 这类新发现的配体了解甚少，但在许多情况下可能与NOM一样重要。 ***