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HERO ID
5073927
Reference Type
Journal Article
Title
Kinetic analysis and degradation mechanism for natural attenuation of xylenes under simulated marine conditions
Author(s)
Duan, W; Meng, F; Peng, X; Lin, Y; Wang, G; Wu, J
Year
2019
Is Peer Reviewed?
Yes
Journal
Ecotoxicology and Environmental Safety
ISSN:
0147-6513
EISSN:
1090-2414
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Location
SAN DIEGO
Volume
168
Page Numbers
443-449
Language
English
PMID
30408745
DOI
10.1016/j.ecoenv.2018.10.103
Web of Science Id
WOS:000453341100050
Abstract
Microcosm experiments were conducted to examine the attenuation of selected chemicals, i.e. m-xylene (MX), o-xylene (OX) and p-xylene (PX), under simulated marine conditions. Natural attenuation and the contribution of oxidation, photodegradation, biodegradation and volatilization to total attenuation were evaluated. The development of attenuation was in agreement with pseudo-first-order kinetics for all xylenes. The half-lives of MX, OX, and PX under optimal conditions were 0.76, 0.74 and 0.88 days, respectively. Attenuation kinetics were proposed to analyze the natural attenuation of xylenes. The leading attenuation type of MX, OX, and PX was volatilization, and the attenuation rate constants (KV) were 0.5587, 0.6733, and 0.4821 d-1, respectively. Biodegradation of OX (Kb: 0.0003 d-1) was extremely inhibited. The attenuation kinetics presented the attenuation of xylenes in microcosm. The reaction kinetics could be applied to analyze the natural attenuation of chemicals. MX and OX can be converted to one another under certain conditions. Toluene and ethylbenzene were detected for OX in the OP (oxidation and photodegradation) experiment under simulated marine conditions. 4-Methylbenzyl alcohol, p-methyl benzaldehyde and p-toluic acid, as the major intermediates, were identified during the natural attenuation of PX using GC/MS.
Keywords
Degradation intermediates; Kinetics; Microcosm; Xylenes
Tags
•
Ethylbenzene
LitSearch Update 2019
WOS
New Litsearch 4/2019
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