Biological Interactions with Iron Oxides and Consequences for Toxic Metal Adsorption

这是对NSF资助号86-17408下发起并在91-00209下继续进行的研究的更新支持，以表征过渡金属对环境健康危害的作用，因为它们的毒性、生物积累的潜力和它们在环境中的持久性。化学平衡模型与先前研究得出的数学模型相结合，将在本项目中得到扩展，以解释与铁氧化物的生物相互作用，这种相互作用控制铁循环和随后对环境重要的微量金属的吸附。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细胞外聚合物对氧化铁吸附铅的影响，以及铁的存在改善对微生物的金属毒性。这项研究包括实验室调查，控制化学条件是表征重要生物和非生物成分所必需的，这些成分将用于指导实地研究。预计这项研究的结果将使人们对污染和污染天然地表水和地下水的金属的行为和命运有更好的了解。从这项研究中获得的知识和由此产生的数学模型可以应用于工艺和处理系统的工程设计中，用于从被污染和污染的自然地表水供应、地下水以及从排放到环境中的家庭和工业废水中去除金属污染物。＊＊＊

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. ***