Competitive Adsorption and Mobility of Propiconazole and Difenoconazole on Five Different Soils
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY(2020)
Abstract
Propiconazole (PPC) and difenoconazole (DFC) are often combined for field applications. The resulted co-exsistence of PPC and DFC may have an effect on the fate of their individuals in soil. In this study, adsorption, desorption and leaching of PPC and DFC alone and their combinations were investigated in five different soils. Adsorption of PPC and DFC was significantly different on each soil with the Freundlich adsorption coefficients of 2.86–28.69 and 14.86–98.93 negatively correlated with soil pH, respectively. In addition, adsorption of PPC and DFC was declined by 27.12–37.59% and 17.28–25.35% with the presence of coexisting DFC and PPC, respectively. Mobility of PPC and DFC in tested soils was enlarged in coexisting system. The results indicate that adsorption, desorption and mobility of PPC and DFC were mainly affected by soil pH, and these behaviors of individual PPC and DFC were obviously altered by their co-existence.
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Key words
Propiconazole, Difenoconazole, Competitive adsorption, Mobility
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