Sorption and degradation of 17β-estradiol-17-sulfate in sterilized soil–water systems. (January 2015)

• Record Type: Journal Article
• Authors: Bai, Xuelian; Casey, Francis X.M.; Hakk, Heldur; DeSutter, Thomas M.; Oduor, Peter G.; Khan, Eakalak
• Is Part Of: Chemosphere. Volume 119(2015)
• Page Start: 1322
• Page End: 1328
• Publication Date: 2015-01
• Subjects: 17β-Estradiol-17-sulfate -- Estrogen conjugate -- Sorption -- Hydroxylation -- Deconjugation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2014.02.016
• Languages: English
• ISSNs: 0045-6535

Abstract

Highlights: Sorption of 17β-estradiol-17-sulfate to the sterile soils is limited with moderate sorption affinities. 17β-Estradiol-17-sulfate undergoes hydroxylation reactions in the sterilized soil–water systems. 17β-Estradiol-17-sulfate can be hydrolyzed to 17β-estradiol on the sorbed phase of the sterilized soils. 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 ( DT 50 ) for E2-17S ranged from 2.5 to 9.3 h 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 K OC 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.