Hydrolysis kinetics of atrazine and influence factors

Article type: Research Article

Authors: Lei, Zhi-fang | Ye, Chang-ming | Wang, Xing-jun

Affiliations: Research Center for Eco-Environmental Sciences, chinese academy of Sciences, Beijing 100085, China. E-mail: yechm@mail.rcees.ac.cn

Note: [] Corresponding author

Abstract: The hydrolysis kinetics of atrazine in distilled water and leaching water from soil, and their influence factors were studied by incubation at 35°C and HPLC analysis method in this paper. The kinetic process of atrazine hydrolysis can be described by the first-order reaction law. The results showed that the hydrolysis rate constants k in leaching water and distilled water were 1.606x10^-³/d and 1.055x10^-³/d, respectively; the half-life of atrazine hydrolysis in distilled water at pH 3, pH 4.5 and pH 8 were 373 days, 522 days and 657 days respectively. The results also showed that the proton in reaction solution can catalyze the atrazine hydrolysis; humic acid and NH_4^+ etc. substances in aqueous solution can facilitate atrazine hydrolysis; rate constants of atrazine hydrolysis with humic acid and NH_4NO_3 were 2.431x10^-³/d and 1.498x10-³/d respectively which were 2.3 and 1.42 times of control(1.055x10-³/d); anion NO_3^- can inhibit catalysis of humic acid to atrazine hydrolysis.

Keywords: atrazine, hydrolysis kinetics, influence factors

Journal: Journal of Environmental Sciences, vol. 13, no. 1, pp. 99-103, 2001