Biological Interactions with Iron Oxides and Consequences for Toxic Metal Adsorption

与氧化铁的生物相互作用以及有毒金属吸附的后果

• 批准号: 9706715
• 负责人: Leonard Lion
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706715&HistoricalAwards=false
• 关键词: Biological; Interactions; Iron; Oxides; Consequences

9706715 Lion This is a renewal of support for research initiated under NSF Grant No. 86-17408 and continued under 91-00209 to characterize the role that transition metals have on hazards to environmental health because of their toxicity, potential for bioaccumulation and their persistence in the environment. Chemical equilibrium models integrated with mathematical models that resulted from prior research will be extended in this project to account for biological interactions with iron oxides that control iron cycling and subsequent adsorption of environmentally significant trace metals. The research includes consideration of biological processes that affect deposition of iron, the effects that bacterial and algal cells and their extracellular polymers have on adsorption of lead by iron oxides, and amelioration of metal toxicity to microorganisms by the presence of iron. The research involves laboratory investigations with controlled chemical conditions necessary to characterize important biotic and abiotic components that will be used to guide field studies. Results of this research are expected to be an improved understanding from that which now exists of the behavior and fate of metals that pollute and contaminate natural surface and groundwaters. Knowledge gained from this research and the resultant mathematical models may be applied in engineering design of processes and treatment systems for removal of metal contaminants from polluted and contaminated natural surface water supplies, groundwater, and from domestic and industrial wastewaters prior to their discharge into the environment. ***

9706715 Lion这是对在NSF资助号86-17408下发起并在91-00209下继续进行的研究的支持，以描述过渡金属对环境健康危害的作用，因为它们的毒性，生物累积的潜力和它们在环境中的持久性。 化学平衡模型与数学模型相结合，导致从以前的研究将在这个项目中扩展到占生物相互作用与铁氧化物控制铁循环和随后的吸附对环境有重要意义的微量金属。 该研究包括考虑影响铁沉积的生物过程，细菌和藻类细胞及其胞外聚合物对铁氧化物吸附铅的影响，以及铁的存在改善金属对微生物的毒性。 该研究涉及实验室调查，控制化学条件，以确定重要的生物和非生物成分的特征，这些成分将用于指导实地研究。 这项研究的结果预计将是一个更好的理解，从现在存在的行为和命运的金属污染和污染自然地表水和地下水。 从这项研究中获得的知识和由此产生的数学模型可应用于工程设计的过程和处理系统，用于从污染和污染的天然地表水供应，地下水，以及从家庭和工业废水中去除金属污染物，然后才排放到环境中。 ***