期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 196, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2020.110586
关键词
Hydrophobic interaction; Hydrogen bond; Pore filling; Hysteresis; Risk
资金
- National Natural Science Foundation of China [41701345, 41877063, U1901601]
Manure fertilization and wastewater irrigation can introduce the biologically potent synthetic progestins into agricultural soils, causing endocrine disruption in organisms of nearby surface waters. Therefore, this study investigated the sorption and desorption potential of etonogestrel, medroxyprogesterone, gestodene, norgestrel, cyproterone acetate, levonorgestrel, and dienogest in five agricultural soil-water systems. Sorption data were well-described by the linear sorption model. In most batch systems, cyproterone acetate exhibited the highest affinities for soils, followed by etonogestrel, medroxyprogesterone, levonorgestrel, gestodene, norgestrel, and dienogest. The sorption magnitudes (logK(oc) or logK(d)) were significantly correlated with the progestin hydrophobicities (R-2 = 0.72-0.86, p < 0.05). The K-d values of the progestins were also significantly correlated with organic carbon content and pore volumes of the soils (R-2 = 0.68-0.98, p < 0.05). In addition, 0.5 M urea resulted in 3-19% decreases in K-d values of the progestins. Taken together, these data indicated that hydrophobic partitioning interaction, hydrogen bonding interaction, and pore filling were the sorption mechanisms for the progestins in soil-water systems. No significant desorption hysteresis was observed for the progestins, indicating that they can be readily desorbed under rainfall or irrigation events. Based on the sorption and desorption data, we estimated the dynamic transport of the progestins in conventional agricultural management systems, and predicted the concentrations of the progestins as a function of soil-sorbed concentration, water-soil ratio, and dilution factor of receiving waters. This study will improve the understanding of the risks posed by the progestins under field-scale hydrological conditions.
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