The degradation rate of chlortoluron is fairly slow with the halflife
over 200 d in water and 30–40 d in soil [4] due to its chemical
stability and resistance to heat. The degradation of chlortoluron is
primarily through microbial transformation and photochemical
processes, which could lead to only partial degradation and the
accumulation of some hazardous products in the environment
[5]. Therefore, World Health Organization (WHO) established a
maximum concentration of chlortoluron as 30 lg/L in the guidelines
for drinking water quality [6].