Photolytic degradation of triclosan in freshwater and seawater.
A 12-days photolysis experiment of triclosan, a widely used bactericide, was performed in freshwater and seawater under a low intensity artificial white light source. Photodegradation of triclosan was observed in both the freshwater and seawater samples. Assuming a first-order reaction, half-lives of triclosan in the freshwater and seawater were approximately 8 and 4 days, respectively. 2,8-Dichlorodibenzo-p-dioxin (DCDD) was detected in both the freshwater and seawater samples after 3 days of irradiation. The photodegradation of triclosan and the production of DCDD suggest that triclosan could be less stable and DCDD might be more stable in seawater than freshwater. As a result, DCDD produced from triclosan survives for a longer time in seawater.
Aranami
Kazushi
K
National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-0053, Japan. arachan4553@hotmail.co.jp
Readman
James W
JW
D004147:Dioxins / Q000138:chemical synthesis; D052918:Environmental Restoration and Remediation / Q000379:methods; D005618:Fresh Water / Q000032:analysis*; D008027:Light; D008956:Models, Chemical; D010782:Photolysis; D012623:Seawater / Q000032:analysis*; D014260:Triclosan / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D004147:Dioxins; D014874:Water Pollutants, Chemical; D014260:Triclosan; C068993:2,8-dichlorodibenzo-4-dioxin