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Abstract
Abstract The effects of humic and fulvic acids and other ligands on apparent monomeric Al concentration were determined by three analytical methods: 8-hydroxyquinoline/MIBK, pyrocatechol violet, and fluoride complexation kinetics. Citric acid and CDTA were found to cause the greatest reduction. Also, ligands with phenolic and/or carboxylic groups in the ortho position caused significant reduction in apparent total monomeric Al concentrations. Each ligand affected each analytical method in varying degrees. The extent to which each method was affected was dependent upon not only the configuration of the competing ligand, but also the relative stability of the Al/measurement-ligand complex, the pH at which the analytical method operated, and the kinetics of the measurement reaction. These factors must be taken into consideration when interpreting total monomeric Al values generated by different analytical methods, particularly when a large fraction of the monomeric Al pool is comprised of organically-bound f...
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