title: Direct photolysis of estrogens in aqueous solutions.
abstract: Direct photolysis of two estrogens 17beta-estradiol (E2) and estrone (E1) in aqueous solutions radiated by UV-light and UV-Vis-light was studied preliminarily. The results suggest that the photolysis of E2 in aqueous solutions occurs under irradiation with UV disinfection lamp (lambda = 254 nm, 30 W), while E1 can also undergo photolysis under irradiation with a high-pressure mercury lamp (lambda > or = 365 nm, 125 W). The photolysis reactions of E2 and E1 at the concentration of 3.0-20 mgl(-1) in aqueous solutions were all in accordance with pseudo-first-order law. The photolysis rate of estrogens in aqueous solutions reached the lowest value at pH approximately 5.0, while the highest at pH 8.0 over the range of 2.0-8.0. The higher the initial concentration of the two estrogens, the lower the rate of photolysis.
authors.affiliation: Department of Environmental and Chemical Engineering, Huangshi Polytechnic College, Huangshi, PR China. liubin0714@sina.com
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Xianli
authors.initials: X
authors.lastname: Liu
mesh_terms: D004958:Estradiol / Q000737:chemistry*; D004970:Estrone / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010777:Photochemistry; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D014873:Water Pollutants; D004970:Estrone; D004958:Estradiol