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+
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.