Abstract: A new residual analytical method of fluazinam in peppers and soils was developed. The fluazinam in samples was extracted by acetone, cleaned up by SPE (solid phase extraction) column, and determined by GC instrument with ECD (electronic capture detector). The linear correlation coefficient of this method was 0.9980, the recoveries ranged from 80% to 94.6%, and the variation coefficient varied from 1.5% to 9.3%. The residue dynamics of fluazinam 50%SC(Suspension Concentrate) in pepper and soil was studied in field conditions. Two-year field trial results showed that the half-lives of fluazinam in peppers and soils was 2.5~3.7days and 1.2~4.2 days, respectively. When the pepper was treated by fluazinam 50%SC at 495g/ha (247.5g a.i./ha) four times at 7 days intervals, on the 7th day after the last application the final residues of fluazinam in peppers were all below 0.06mg/kg, which was below MRL(Maximum Residue Limit) (0.1mg/kg) fixed in Korea. It is implied that fluazinam in pepper is non-persistent. The results suggested that fluazinam 50%SC be used in pepper field at most 4 times and the pre-harvest interval be 7 days.

Key words: fungicide, fluazinam, Residue, pepper, Soil