An analytical method for determining residues of the fungicide tricyclazole (5-methyl-l,2,4-triazolo-[3,4-b]benzothiazole) and the major metabolite (l,2,4-triazolo[3,4-6]benzothiazole-5-methanol) in rough rice, grain components, and straw has been developed with flame photometric-gas chromatographic detection. Rice plants were foliar sprayed with tricyclazole at booting growth stage with a single 0.5 lb/A application or dual applications of 0.25 lb/A at booting and early heading growth stages. Maximum tricyclazole residues found in rough rice and straw were 3.9 and 3.5 ppm, respectively. Maximum metabolite residues found in rough rice and straw were 1.1 and 10.2 ppm, respectively. The limit of detection for tricyclazole or the alcohol metabolite in rough rice was 0.02 ppm based on a 25.0-g sample. Recoveries at the 0.10 ppm fortification level were approximately 77% for tricyclazole and 57% for the metabolite. The alcohol metabolite was derivatized and chromatographed as the trimethylsilyl (Me3Si) ether.
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