Affiliations: Environmental Science Institute, Zhejiang University,
Hangzhou 310027, China. E-mail: wpliu @ mail. hz. zj. cn
Abstract: Kinetic processes of alpha-naphthaleneacetic acid (NAA) photolysis
were studied under different conditions. The results showed that the
ultraviolet light was more effective than fluorescent light in promoting
degradation, and the degradation of NAA under ultraviolet light followed the
first order kinetics with the photolysis rate constant of 1.15 x 10^-²
min^-¹ and half-life time (t_½) of 60 min. Further, it was proved
that the photolysis rate was higher in the presence of oxygen, titanium dioxide
(TiO_2), and low pH ( acidic solution). At last, two photolysis intermediates
were identified by GC-MS and possible photolysis pathways were proposed.