CAREER: Metal Partitioning and Surface Reactions in Natural and Model Systems: Research and Education

9629276 O’day这个教师早期职业发展提案的研究项目包括：(1)亚利桑那州Pinal Creek现场样品的光谱和微观表征；(2)锌吸附和沉淀的模型研究以及x射线吸收光谱对反应产物的表征。在第一阶段，PI将直接验证与河床和冲积沉积物中固相相关的Co， Ni， CU和Zn的化学状态和分布，并确定非晶相和结晶相的性质和数量。第2部分将重点介绍Zn（OH）吸附系统的两个方面：(I)矿物基质对Zn吸收和释放的影响以及XAS吸附过程中配位变化的鉴定；（II） Zn(OH)2均相沉淀和表面沉淀的局部分子结构和动力学。样品表征将由SIMS和探针完成。分析方法包括TEM， PEELS和XAS。

9629276 O'Day The proposed research program of this Faculty Early Career Development proposal involves: (1) Spectroscopic and microscopic characterization of field samples from Pinal Creek, AZ. and (2) model studies of Zn sorption and precipitation and the characterization of reaction products by X-ray absorption spectroscopy. During the first phase, the PI would like to directly verify the chemical state and distribution of Co, Ni, CU and Zn associated with solid phases in the stream bed and alluvial sediments, and determine the nature and amount of amorphous and crystalline phases. Part 2 will focus on two aspects of the Zn (II) sorption system: (I) The influence of mineral substrate on uptake and release of Zn and the identification of coordination change with sorption with XAS, and (ii) the local molecular structure and kinetics of Zn(OH)2 homogenous precipitation and surface precipitation. Sample characterization will be done by SIMS and probe. Analytical methods to be used include TEM, PEELS, and XAS.