Chemical Species of Al in a Gypsum-Treated Kitakami Andosol : Direct Analysis of Al Adsorbed on Cation Exchange Resin Using ^<27>Al NMR

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To examine the possibility that the Al_<13> polymer ([AlO_4Al_<12>(OH)_<13>_<24>(H_2O)_<12>]^<7+>) could be formed in soils after gypsum application, an analytical method using a cation exchange resin and ^<27>Al nuclear magnetic resonance (NMR) spectroscopy was applied to gypsum-treated Kitakami Andosol (fine, mixed, roesic, Andic Dystroehrept). The NMR spectra of the cation exchange resins which retained artificially synthesized hydroxy-Al, showed two broad peaks at 0 and 63 ppm. These results indicated that monomer and/or dimer Al and Al_<13> polymers adsorbed on the cation exchange resin could be detected with ^<27>Al NMR. The amount of polymer Al increased by gypsum application in the Kitakami soil. The NMR spectrum of this resin showed only one peak at 0 ppm indicating that the polymer Al formed in the gypsum treated Kitakami soil was not the Alls polymer.
社団法人日本土壌肥料学会の論文