Figure 4
(a) Phosphorus K-edge XANES spectra of crystalline AlPO4, non-crystalline AlPO4, free inositol hexakisphosphate (IHP), Al phytate, as well as of orthophosphate or IHP retained by boehmite, Al-saturated montmorillonite and Al-saturated soil organic matter (SOM from the O layer of forest soil Waldsassen, Germany); initial pH 4.0. (b) Close-up view of pre-edge energy region. (c) Close-up view of post-edge region. |