title: Comparison of Fenton's oxidation and ozonation for removal of estrogens.
abstract: This study compares efficiency of Fenton's oxidation and ozonation of 17beta-estradiol (E2) and 17alpha-ethinylestradiol (EE2) as two possible processes for removal of estrogens from aqueous solutions. The effectiveness of Fenton's oxidative removal was studied at different ratios of reagents Fe2+:H2O2 (1:0.5; 1:10; 1:20; 1:33), where with some molar ratios up to 100% removal of E2 and EE2 was achieved in the first few minutes of reaction. The best molar ratio for E2 (17beta-estradiol) removal was 1:33, while in the case of EE2 the most efficient one was 1:20 ratio. Ozonation was much faster, because complete removal of estrogens was achieved in 30 seconds (pH approximately eaqual 6), but the time of ozonation was extended up to 60 minutes trying to decompose formed by-products, expressing estrogenic activity, detected by YES (Yeast Estrogen Screening) assay. The obtained results showed that the removal efficiency of estrogens from waters should be assessed by a combination of chemical analyses and bioassay.
authors: University of Ljubljana, Faculty of Chemistry and Chemical Technology, Askerceva 5, SI-1000 Ljubljana, Slovenia.
authors: Jana
authors: J
authors: Nakrst
authors: Mirjana
authors: M
authors: Bistan
authors: Tatjana
authors: T
authors: Tisler
authors: Jana
authors: J
authors: Zagorc-Koncan
authors: Jan
authors: J
authors: Derco
authors: Andreja Zgajnar
authors: AZ
authors: Gotvajn
mesh_terms: D004958:Estradiol / Q000302:isolation & purification*; D004997:Ethinyl Estradiol / Q000302:isolation & purification*; D005240:Feasibility Studies; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D052617:Solid Phase Microextraction; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: C045076:Fenton's reagent; D014874:Water Pollutants, Chemical; D004997:Ethinyl Estradiol; D004958:Estradiol; D010126:Ozone; D006861:Hydrogen Peroxide; D007501:Iron