Abstract: A method for the determination of herbicide residues in rice was established by gas chromatography. The method was validated by flame photometric detector FPD, external standard method and automatic injection. The results showed that the detection limit of diclofenac sodium was 2 μg/kg （injection volume was 1 μL, S/N 3）, the linear range of standard curve was 10~100 μg/kg （r =0.999 74）, the recovery of standard addition was 80.0%~97.5%, RSD （n=10） was 3.28%. The method has the advantages of high recovery rate, good reproducibility and short analysis time. It is an accurate, fast and simple detection method.

Key words: gas chromatography, rice, molinate, flame photometric detector