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Cation exchange and size exclusion high-performance liquid-chromatographic methods with postcolumn fluorescence detection using 5-sulfo-8-quinolinol were applied to the chemical speciation of aluminum in soil-extract samples. The addition of an appropriate amount of F-to the postcolumn reagent solution makes it possible to eliminate the interference of F-in a sample with A13+ detection. The reliability of this method was evaluated by a computer-assisted equilibrium calculation for aluminum species and ICP atomic emission spectrometry. Considerable parts of water-soluble A13+ (the A13+ fraction extracted into distilled water) in both sedimentary and granitoid soil samples were found to be complexed with organic substances. On the other hand, exchangeable A13+ (the A13+ fraction extracted into 1 mol dm-3 KCl) in granitoid soil samples was mostly free A13+

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The use of electrospray ionization mass spectrometry (ESI-MS) in negative ion mode was investigated as a direct probe for identifying Al species in Al-accumulating hydrangea (Hydrangea macrophylla) samples. Cell sap solutions of hydrangea leaves were purified using Sephadex G-10 liquid chromatography and each fraction was analyzed using ESI-MS and ESI-MS/MS to identify Al species. In hydrangea leaves, a 1:1 Al-citrate complex was found as -(m/z 215), where H3cit denotes citric acid. This result is consistent with that of Ma et al. who used 27 Al-NMR.