Keywords: 
• tebuconazole /
• degradation /
• adsorption /
• bioconcentration

Abstract: Tebuconazole is a systemic triazole fungicide, which was applied to control pests in the fields frequently in China, so increased concern focused on the environmental behavior of this kind of pesticide. In this study, we investigated the degradation of tebuconazole in water-sediments and its bioconcentration in zebrafish by simulation test in laboratory systematically. The result showed that the half-times of tebuconazole in water-sediment system were 533.2 d (river system) and 433.2 d (lake system) under aerobic conditions, while these were 364.8 d (river system) and 1 732.9 d (lake system) under anaerobic conditions, indicating that the degradation rate was slow in both lake system and river system. In the water-sediment system, the effect of degradation rate is mainly dependent on the degradation in water. Adsorption results showed that the adsorption of tebuconazole on tested soils fits well with Freundlich model, and the adsorption coefficient (K_d) was 7.4 in Jiangxi red soil, 11.8 in Taihu paddy soil, 11.2 in Changshu wushan soil, and 15 in Northeast black soil, respectively. The adsorption capacity ranked as Northeast black soil > Taihu paddy soil > Changshu wushan soil > Jiangxi red soil. The adsorption of tebuconazole on soil was primarily related to the organic carbon and pH of soils. The bioconcentration factors (BCF, 8 d) of tebuconazole in Brachydanio rerio were between 21.5 and 25.3, showing that tebuconazole was classified as medium bioconcentration pesticide. Due to the fact that tebuconazole has long-term retention in sediment and showed medium bioconcentration, tebuconazole may cause pollution in water body and affect aquatic organism.