Department of Soil Science, College of Agriculture and Bioresources, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, Canada S7N 5A8.
Environ Sci Technol. 2012 Mar 20;46(6):3163-8. doi: 10.1021/es203816x. Epub 2012 Mar 9.
Ferrihydrite is a common iron hydroxide nanomineral commonly found in soils, sediments, and surface waters. Reactivity with this important environmental surface often controls the fate and mobility of both essential nutrients and inorganic contaminants. Despite the critical role of ferrihydrite in environmental geochemistry, its structure is still debated. In this work, we apply bulk sensitive Fe L edge X-ray absorption spectroscopy to study the crystal field environment of the Fe in ferrihydrite and other Fe oxides of known structure. This direct probe of the local electronic structure provides verification of the presence of tetrahedrally coordinated Fe(III) in the structure of ferrihydrite and puts to rest the controversy on this issue.
水铁矿是一种常见的纳米氢氧化铁矿物，通常存在于土壤、沉积物和地表水。这种重要的环境表面的反应性通常控制着必需养分和无机污染物的命运和迁移。尽管水铁矿在环境地球化学中起着至关重要的作用，但它的结构仍存在争议。在这项工作中，我们应用了对整体敏感的 Fe L 边 X 射线吸收光谱来研究水铁矿和其他已知结构的 Fe 氧化物中 Fe 的晶体场环境。这种对局部电子结构的直接探测证实了水铁矿结构中存在四面体配位的 Fe(III)，并解决了这个问题上的争议。
