کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5746703 | 1618786 | 2017 | 7 صفحه PDF | دانلود رایگان |
- Natural attenuations of phenols were simulated in microcosms.
- Half-lives of natural attenuation of phenols were obtained.
- Proposed kinetics explained the attenuation of phenols in detail.
Phenol, o-cresol, m-cresol, and p-cresol were selected to conduct microcosm experiments to examine their attenuation under simulated marine conditions, aiming at estimating natural attenuation and the contribution of oxidation, photolysis, biodegradation, and volatilisation to total attenuation of phenol and three cresols in the marine environment. The development of attenuation in microcosms showed the relevance of the pseudo-first-order kinetic for all phenols. The half-lives of phenol, o-cresol, m-cresol, and p-cresol attenuation under optimal conditions were 7.9, 4.3, 5.3, and 4.4Â d, respectively. Attenuation kinetics was proposed to analyse the natural attenuation of phenol and cresols. The leading attenuation type of phenol, o-cresol, and p-cresol was volatilisation, and the attenuation rate constants (Kv) were 0.0356, 0.0687, and 0.0710 dâ1. Photolysis (Kp: 0.0584 dâ1) was the major attenuation type for m-cresol. Biodegradation of phenol (Kb: 0.0021 dâ1) and m-cresol (Kb: 0.0049 dâ1) were extremely inhibited. The rank between the contributions of the four types of attenuation to total attenuation differed between phenol and the three cresols. The attenuation kinetics proposed in this study possibly demonstrated the attenuation of the phenol and cresols in microcosm. This new reaction kinetics can be used in the analysis of natural attenuation of chemical substances.
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Journal: Chemosphere - Volume 185, October 2017, Pages 595-601