Abstract
Photodegradation of carbetamide (( R)-1-(ethylcarbamoyl)ethyl carbanilate) and metoxuron (3-(3-chloro-4-methoxyphenyl)-1,1-dimethylurea) in the presence of hydrogen peroxide, titanium dioxide and ozone was investigated with ultraviolet radiations ( λ > 290 nm). Several photoproducts were isolated and identified by spectrometric methods. The results suggest that the degradation pathways of these compounds in the presence of UV-H 2O 2 and UV-TiO 2 are hydroxylations of the aromatic ring. UV-ozonation rapidly photooxydized all pesticides. The opening of the aromatic rings was observed, producing lower molecular weight carboxylic acids. Further photooxidation converts the acids to CO 2, H 2O, HCl and NH 3.
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