Journal
ENVIRONMENTAL POLLUTION
Volume 247, Issue -, Pages 362-370Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.01.065
Keywords
Short-chain chlorinated paraffins; Photochemical degradation; Laser flash photolysis; Theoretical calculation; Degradation mechanism
Categories
Funding
- National Natural Science Funds for Distinguished Young Scholars [41425015]
- National Natural Science Foundation of China [41603115, 41573086]
- Leading Scientific, Technical and Innovation Talents of Guangdong special support program [2016TX03Z094]
- National Natural Science Foundation of Guangdong, China [2016A030310120]
- Science and Technology Program of Guangzhou, China [201804010128]
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Short chain chlorinated paraffins (SCCPs) have attracted worldwide attention in recent years, due to their high production volume, persistent, bioaccumulative and toxic properties. In this study, 1-chlorodecane (CD) was selected as a model of SCCPs to explore its photochemical degradation behavior under UV irradiation. The results found that CD could be completely photochemical degradation within 120 min, and the (OH)-O-. was found to be the main reactive species from both quenching experiments and electron paramagnetic resonance (EPR) results. However, the contribution of triple excited state of CD ((CD)-C-3*) was still nonnegligible from the results with the absorption peak at 480 nm obtained by laser flash photolysis. Based on the identified intermediates as well as the data from theoretical chemical calculation, the detailed photochemical degradation mechanism of CD was tentatively proposed that CD firstly was excited and photo-ionized under UV irradiation, and the released CI. in water could result in generating (OH)-O-.. Then (OH)-O-. initiates CD degradation mainly through the H-abstraction pathway, leading to the generation of several dehydrogenation radicals, which further generated alcohols or long chain intermediates through radical-radical reactions. The results will provide a comprehensive understanding of the degradation mechanism and environmental fates of SCCPs in water under UV irradiation. (C) 2019 Elsevier Ltd. All rights reserved.
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