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Kinetic Studies of the Reactions of Benzidine with Humic Acid
Author(s) -
Oye Aloysius I.,
Graveel John G.,
Wolt Jeffrey D.
Publication year - 1989
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1989.03615995005300030060x
Subject(s) - benzidine , chemistry , humic acid , kinetics , sorption , amine gas treating , biphenyl , aqueous two phase system , phase (matter) , organic chemistry , inorganic chemistry , nuclear chemistry , adsorption , fertilizer , physics , quantum mechanics
The mechanism of the reaction of benzidine (4,4′‐diaminobiphenyl), a toxic biphenyl amine, with humic acid in aqueous solutions has been studied using both commercial and soil‐extracted samples of humic acid. The reaction trend is similar for all the samples and involves a byphasic decay in the concentration of benzidine. The phase I reaction is rapid and complete within 1 h and is approximated by second‐order kinetics, while the phase II reaction (a slow process which attains a steady state in benzidine concentration after about 14 d) follows a single exponential first‐order reaction with respect to benzidine. Sorption of benzidine by humic acid was higher for the commercial samples than for the soil‐extracted sample.