Transformation of 17α-Ethinylestradiol during Water Chlorination: Effects of Bromide on Kinetics, Products, and Transformation Pathways.
In: Environmental Science & Technology, Jg. 43 (2009-01-15), Heft 2, S. 480-487
academicJournal
Zugriff:
Kinetics, products, and pathways of 17α-ethinylestradiol (EE2) transformation during chlorination of water with and without bromide (Br-) were studied to evaluate the effect of chlorination on the fate of steroid estrogens. Br- can be important for the fate of EE2 during chlorination because of a rapid conversion of Br- to bromine by chlorine and a ∼1000 times higher reactivity of bromine than chlorine toward EE2. Experimental data and model calculations for EE2 chlorination show that 4-chloro EE2 and 2,4-dichloro EE2 are the major initial transformation products in absence of Br-. With increasing concentration of Br-, the bromo-analogous of the chloro EE2s becomes significant as additional initial transformation products. Those initial transformation products of EE2 are generally quickly further transformed to products with a destroyed phenolic moiety. Transformation of EE2 during chlorination becomes considerably faster at Br- concentrations higher than 0.25 μM (20 μg L-). However, in presence of model dissolved organic matter such as glycine or phenol, the accelerating effect of Br- diminishes due to a more rapid consumption of bromine than chlorine by these compounds. A kinetic model was developed which allows to predict EE2 transformation during chlorination of natural waters and wastewaters in presence of Br- and low concentrations of ammonia (<10 μM). It could be demonstrated in these systems that bromine produced from Br- is mainly responsible for EE2 transformation. [ABSTRACT FROM AUTHOR]
Titel: |
Transformation of 17α-Ethinylestradiol during Water Chlorination: Effects of Bromide on Kinetics, Products, and Transformation Pathways.
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Autor/in / Beteiligte Person: | YUNHO, LEE ; VON GUNTEN, URS |
Zeitschrift: | Environmental Science & Technology, Jg. 43 (2009-01-15), Heft 2, S. 480-487 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0013-936X (print) |
DOI: | 10.1021/es8023989 |
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