Hits:

Indexed by:期刊论文

Date of Publication:2016-05-01

Journal:CHEMOSPHERE

Included Journals:SCIE、EI、PubMed

Volume:150

Page Number:453-460

ISSN No.:0045-6535

Key Words:Novel brominated flame retardants; Photolytic kinetics; Direct photolysis half-lives; Phototransformation products

Abstract:Many novel brominated flame retardants (NBFRs) are used as substitutes of polybrominated diphenyl ethers (PBDEs) in recent years. However, little is known about their phototransformation behavior, which may influence the environmental fate of these chemicals. In this study, photochemical behavior of five NBFRs, allyl-2,4,6-tribromophenyl ether (ATE), 2-bromoallyl-2,4,6-tribromophenyl ether (BATE), 2,3-dibromopropyl-2,4,6-tribromophenyl ether (DPTE), 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE), and 246-tris(2,4,6-tribromophenoxy)-1,3,5-triazine (TTBP-TAZ) was investigated. Results show all the five NBFRs can undergo photochemical transformation under simulated sunlight irradiation. Quantum yields (Phi) of the five NBFRs varied from 0.012 of TTBP-TAZ in hexane to 0.091 of BTBPE in methanol. Half-lives (t(1/2)) relevant with solar irradiation of these NBFRs were estimated using the determined Phi, and the values are 1.5-12.0 d in summer and 17.1-165.0 d in winter. Debrominated and ether bond cleavage products were identified in the phototransformation of DPTE and BTBPE. Debromination on the phenyl is a main phototransformation pathway for DPTE, and both debromination and ether bond cleavage are main phototransformation pathways for BTBPE. This study is helpful to better understand the photo transformation behavior of the NBFRs. (C) 2015 Elsevier Ltd. All rights reserved.