Absorption, translocation, and residue of 14C-ZJ0273 in oilseed rape.

A study was conducted to investigate the absorption and translocation of a novel herbicide (14)C-ZJ0273 in the seedlings and the residue in the mature plants of oilseed rape. Total absorption of (14)C-ZJ0273 into seedlings and mature plants of oilseed rape reached 39.7% and 34.2% at the end of the experiments, respectively. Movement of the absorbed (14)C in the plants was both acropetal and basipetal. However, more than 89.2% of the absorbed (14)C remained in the treated leaf of the tested plants. The distribution of the absorbed (14)C in the seedlings followed the order treated leaf (TL) > leaves above the treated leaf (LATL) > leaves below the treated leaf (LBTL) > roots and stalks, while in the mature oilseed rape, the order followed was TL > LATL > LBTL and stems > seed capsules, seed, and roots > branches. Only the parent compound ZJ0273 was found in the extractable residue of the oil rape seeds with a concentration of 0.09 mg per kg dry weight. The residue level in oil seeds suggested a low dietary exposure for humans if recommended application rates were followed.