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Perdue E. M., Reuter J. H., and Ghosal M. (1980) The
operational nature of acidic functional group analyses and its
impact on mathematical descriptions of acid¨Cbase equilibria
in humic substances. Geochim. Cosmochim. Acta 44,
1841¨C1851.

Perdue E. M. (1985) Acidic functional groups of humic
substances. In Humic Substances in Soil, Sediment, and
Water: Geochemistry, Isolation, and Characterization
(eds. G. R. Aiken, D. M. McKnight, R. L. Wershaw,
and P. MacCarthy). Wiley, New York, pp. 493¨C526.

Ritchie J. D. and Perdue E. M. (2003) Proton binding study of
standard and reference fulvic acids, humic acids, and natural
organic matter. Geochim. Cosmochim. Acta 67, 85¨C96.

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