Photodegradation of Decabrominated Diphenyl Ether in Soil Suspensions: Kinetics, Mechanisms and Intermediates

Pollution by polybrominated diphenyl ethers (PBDEs) is a major concern due to their bioaccumulation, persistence, and carcinogenicity. This study aimed investigate the decabrominated ether (BDE-209) photodegradation in soil suspensions. The results indicate BDE-209 can degrade suspensions its degradation follows pseudo-first-order kinetics. light sources intensity effects were studied rates 500 W Mercury Lamp > 300 Xenon Lamp, which indicates UV main reason for degradation. Soil particle inhibits light-shielding effect. increased from 0.055 0.071 h?1 with pH value increasing 3.5 9.5. may be because products are more easily produced higher presence of humic acid (HA) inhibit photo-shielding. Fe3+ Cu2+ have an adverse effect on photo competition. •OH 1O2 detected solutions. Analysis photoproducts gas chromatography mass spectrometry (GC-MS) liquid time flight (LC-TOF-MS) showed that was mainly debrominated lower-brominated BDEs reactive oxygen radicals not lead