Sorption and desorption of [A ring-U-14C] ZJ0273 in soils

ZJ0273, propyl 4-(2-(4, 6-dimethoxypyrimidin-2-yloxy) benzylamino) benzoate, is a novel herbicidal ingredient obtained temporary registration in China for weed control in oilseed rape field. In this study, [A ring-U-14C]ZJ0273, propyl 4- (2-(4,6-dimethoxypyrimidin-2-yloxy) benzylamino) [phenyl-U-14C6]benzoate, were applied in 7 soils to investigate sorption and desorption of ZJ0273. The results revealed for all soils studied that (1) Freundlich-model, Langmuir-model and Linear- model fit the sorption isotherm of ZJ0273 well, and the correlation coefficient of the two former models (R2=0.9883- 0.9998) were better than that of linear-model(R2=0.9173-0.9593); (2) Desorption isotherm was better described by using Freundlich-model and linear-model; (3) [A ring-U-14C] ZJ0273 was ready to be sorbed, the constant KF was positively related to soil organic matter (SM) the desorption ratios of [A ring-U-14C]ZJ0273 was extra low, and obvious hysteresis could be found in the sorption and desorption of [A ring-U-14C]ZJ0273 in the tested soils. (authors)