title: Sorption and degradation of 17β-estradiol-17-sulfate in sterilized soil-water systems.
abstract: To identify abiotic processes that govern the fate of a sulfate conjugated estrogen, 17β-estradiol-17-sulfate (E2-17S), soil batch experiments were conducted to investigate the dissipation, sorption, and degradation of radiolabeled E2-17S under sterilized conditions. The aqueous dissipation half-lives (DT50) for E2-17S ranged from 2.5 to 9.3h for the topsoil of high organic carbon (OC) content (1.29%), but E2-17S remained at ∼80% of applied dose in the low OC (0.26%) subsoil by 14 d. The non-linear sorption isotherms indicated limited sorption of E2-17S, and the concentration-dependent log KOC values were 2.20 and 2.45 for the topsoil and subsoil, respectively. Additionally, two types of hydroxyl E2-17S (OH-E2-17S and diOH-E2-17S) were found as major metabolites in the aqueous phase, which represented 9-25% and 6-7% of applied dose for the topsoil and subsoil at 14 d, respectively. Free estrogens, 17β-estradiol (E2) and estrone (E1), were detected from the sorbed phase of the soil-water systems.
authors.affiliation: Department of Soil Science, North Dakota State University, Fargo, ND 58108-6050, USA.
authors.forename: Xuelian
authors.initials: X
authors.lastname: Bai
authors.affiliation: Department of Soil Science, North Dakota State University, Fargo, ND 58108-6050, USA. Electronic address: Francis.Casey@ndsu.edu.
authors.forename: Francis X M
authors.initials: FXM
authors.lastname: Casey
authors.affiliation: Biosciences Research Laboratory, USDA-ARS, Fargo, ND 58102-2765, USA.
authors.forename: Heldur
authors.initials: H
authors.lastname: Hakk
authors.affiliation: Department of Soil Science, North Dakota State University, Fargo, ND 58108-6050, USA.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: DeSutter
authors.affiliation: Department of Geosciences, North Dakota State University, Fargo, ND 58108-6050, USA.
authors.forename: Peter G
authors.initials: PG
authors.lastname: Oduor
authors.affiliation: Department of Civil Engineering, North Dakota State University, Fargo, ND 58108-6050, USA.
authors.forename: Eakalak
authors.initials: E
authors.lastname: Khan
mesh_terms: D000327:Adsorption; D004958:Estradiol / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D004967:Estrogens / Q000032:analysis / Q000737:chemistry; D004970:Estrone / Q000032:analysis / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D013242:Sterilization; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D004967:Estrogens; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D014867:Water; D004970:Estrone; C048615:estradiol 17-sulfate; D004958:Estradiol
keywords: 17β-Estradiol-17-sulfate; Deconjugation; Estrogen conjugate; Hydroxylation; Sorption