Characterization of Metal Ion Complexation and Aggregation of Humic Substances

金属离子络合和腐殖质聚集的表征

• 批准号: 9524865
• 负责人: W. Robert Carper
• 金额: $ 14.3万
• 依托单位: Wichita State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-09-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9524865&HistoricalAwards=false
• 关键词: Characterization; Metal; Ion; Complexation; Aggregation

This award in the Chemistry Division supports research by W. Robert Carper of the Chemistry Department, Wichita State University, for the development of a new method for characterizing metal ion complexation and the aggregation of humic and fulvic acids isolated from ground and surface waters. The award is made in the Environmental Geochemistry and Biogeochemistry section of the Water and Watersheds activity of the 1995 NSF/EPA Partnership for Environmental Research. Collaborating on the project is Cynthia K. Larive of the Chemistry Department, University of Kansas. Pulsed field gradient nuclear magnetic resonance (NMR) spectroscopy will be used to determine the aggregation state of humic and fulvic acids and the degree of metal-ion induced aggregation. Potentiometric titration methods will be used to measure metal ion complexation, and NMR relaxation rates will indicate metal ion exchange rates and formation constants. This broad-based approach will enable investigators to construct a model of competitive metal ion binding and exchange rates in fulvic and humic acids. Samples from the Suwannee and Wakarusa Rivers will be used in initial tests of the generality of the new method. Humic and fulvic acids leach into ground and surface waters from soil and plant organic matter and are inherently heterogeneous in nautre. They are the major constituents of dissolved organic carbon and, as a group, interact with organic pollutants such as pesticides and herbicides, increasing their solubility. For this reason, they play an important role in the transport and bioavailability of anthropogenic organic contaminants. This research is focused on the participation of humic and fulvic acids in the complexation of metal ions and the development of new methods for analysis which will simultaneously determine metal ion concentration, complexation, and aggregation in samples from natural systems.

化学部的这一奖项支持W.罗伯特 威奇托州立大学化学系的Carper， 开发了一种表征金属离子络合作用的新方法， 从地面分离的腐殖酸和富里酸的聚集， 地表沃茨。 该奖项颁发给环境地球化学领域， 1995年水和流域活动的生物地球化学部分 NSF/EPA环境研究伙伴关系。 合作开展 项目是辛西娅K。拉瑞夫，哥伦比亚大学化学系 堪萨斯。 脉冲场梯度核磁共振（NMR） 光谱学将用于确定腐殖酸的聚集状态， 富里酸和金属离子诱导的聚集程度。 电位滴定法将用于测量金属离子 络合，NMR弛豫速率将指示金属离子交换 速率和形成常数。 这种基础广泛的方法将使 研究人员构建了竞争性金属离子结合的模型， 富里酸和腐殖酸的交换率。 从萨旺尼河采集的样本， Wakarusa河流将用于初步测试的一般性， 新方法 腐殖酸和富里酸从土壤中渗入地下水和地表水沃茨， 植物有机质和天然的内在异质性。 他们 是溶解有机碳的主要成分，作为一个群体， 与杀虫剂和除草剂等有机污染物相互作用， 增加其溶解度。 因此，他们扮演着重要的角色。 在人为有机污染物 污染物。 本研究的重点是参与腐殖酸和 富里酸对金属离子的络合作用及其新的研究进展 同时测定金属离子的分析方法 浓度，络合和聚集在样品中，从自然 系统.