Abstract: To investigate the distribution of omethoate residues in fruits and vegetables, different parts of Chinese cabbage and apple were analyzed by gas chromatography (GC). The results indicated that the contents of omethoate residues in Chinese cabbage leaves was higher than that in the stems and declined gradually from outside to inside in the whole cabbage; the highest, middle lowest contents of omethoate residues was found in the peel of apple, followed by in the pulp and in the core of apple successively; and the maximal natural degradation rates of omethoate in Chinese cabbage and apples appeared around 10－15 days after spraying on their surface.

Key words: gas chromatography, omethoate, residue, natural degradation rate, Chinese cabbage, apple