FATE OF [C-14/H-3]EMAMECTIN BENZOATE IN CABBAGE .1. EXTRACTABLE RESIDUES

摘要

Cabbage, after treatment with eight weekly applications of the semisynthetic avermectin at a 0.015 lb a.i./acre (1x) or a 5x rate, was collected at preharvest intervals (PHI) from 2 h to 10 d. For foliage at 2 h to 10 d PHI: (1) the total C-14-residue declined from 450 to 200 (1x) or 2900 to 1300 (5x) ppb, (2) the total C-14-residue was 78-92% extractable, (3) the extractable residue consisted of the parent as well as polar and avermectin-like residues, (4) the parent declined from 90 to 7 ppb (1x), and (5) polar residues in toto ranged from 120-170 ppb (1x). For the extractable residue, (1) 10 avermectin-like residues were identified with the parent accounting for 4-38% of the total, (2) the polar residues were found to be extremely complex, consisting of many minor components and no apparent conjugates, and (3) the polar residues in toto accounted for 23-75% of the total. [References: 13]