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

9629276 O'Day本学院早期职业发展建议的拟议研究计划包括：（1）从皮纳尔溪，亚利桑那州的现场样品的光谱和显微镜表征。（2）Zn吸附和沉淀的模型研究以及反应产物的X射线吸收光谱表征。 在第一阶段，PI希望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部分将集中在两个方面的Zn（II）吸附系统：（I）的影响，矿物基质的吸收和释放的Zn和识别的配位变化与吸附与XAS，和（ii）的局部分子结构和动力学的Zn（OH）2均匀沉淀和表面沉淀。 将通过西姆斯和探针进行样品表征。使用的分析方法包括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.