Keywords: 
• bromacil /
• degration in soil /
• adsorption /
• migration

Abstract: Bromacil is a kind of pyrimidine compounds, and the environmental behavior of bromacil has brought increasing concern. The degradation, adsorption and migration behavior of bromacil in different soils were system atically investigated by simulation test in laboratory. The results showed that the degradation half-lives of bromacil were 693.1, 173.3 and 138.6 d in Jiangxi red soil, Taihu paddy soil and the Northeast black soil in China, respectively, indicating that the soil degradation rate was relatively slow, and the major influncing factors of the soil degradation of bromacil was soil organic matter content. The adsorption of bromacil in the soils could be well fitted by the empirical Freundich isotherm. The adsorption constants (K_d) were 0.34, 1.86 and 2.94 in Jiangxi red soil, Taihu paddy soil, the Northeast black soil, respectively. The bromacil adsorption by soils belonged to spontaneous physical adsorption. TLC results showed that the movement distances of bromacil were 8-10 cm in Jiangxi red soil, Taihu paddy soil and the Northeast black soil when the solvent expanded to 11.5 cm. The result of the mobility test showed that bromacil is ready to move in the test soils. The soil organic matter content was the dominant factor affecting the adsorption and movement of bromacil in soils. It was demonstrated that there is potential risk of contaminating groundwater by bromacil. Therefore, enough attention should be paid to its application.