Sorption and transport of 17[beta]-estradiol and testosterone in conventionally tilled and no-till Cecil sandy loam
Sangsupan, Hathai Anna
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17²-estradiol (henceforth, estradiol) and testosterone in land-applied poultry manure maybe transported through soil to groundwater and streams, where they pose a potential health threatto humans and wildlife. This study determined soil sorption and transport characteristics ofestradiol and testosterone under no-till and conventional tillage. Batch isotherms indicated non-linear adsorption for both hormones. Estradiol sorbed more strongly than testosterone. Sorptionof both hormones decreased with soil depth. In transport experiments with intact soil columns,-detectable concentrations of both hormones broke through simultaneously with Cl tracer in 86%of the soil columns. Transport parameters were fitted to the column breakthrough curves usingphysical nonequilibrium transport, chemical nonequilibrium transport, and effective dispersionmodels. Although the sorption coefficients for both hormones were high, the hormones movedrapidly through the soil via preferential flow. The results suggest that hormones placed on thesoil surface may contaminate groundwater under conditions of preferential flow.