Photooxidation of probe compounds sensitized by crude oils in toluene and as an oil film on water

The effect of crude oil residues on the photolysis of model crude oil components (3,6-dimethylphenanthrene (DMP), dibenzothiophene (DBT), di-n-butylsulphide (DBS), tetramethylethylene (TME), alpha-terpinene, 2,6-di-tert-butyl-4-methylphenol (BHT), and tetralin) in toluene was studied. The residues h...

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Bibliographic Details
Published inEnvironmental science & technology Vol. 23; no. 1; pp. 39 - 45
Main Authors LICHTENTHALER, R. G, HAAG, W. R, MILL, T
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 1989
Subjects
Applied sciences
Biological and physicochemical phenomena
Exact sciences and technology
Natural water pollution
Pollution
Water treatment and pollution
Solvent effect
Pollutant behavior
Toluene
Quantum yield
Free radical reaction
Photolysis
Simulation
Crude oil
Oxidation
Water pollution
Kinetics
Solar radiation
Photosensitizer
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Summary:The effect of crude oil residues on the photolysis of model crude oil components (3,6-dimethylphenanthrene (DMP), dibenzothiophene (DBT), di-n-butylsulphide (DBS), tetramethylethylene (TME), alpha-terpinene, 2,6-di-tert-butyl-4-methylphenol (BHT), and tetralin) in toluene was studied. The residues had no sensitizing effect on DMP or DBT photolysis. BHT was used as a probe for peroxy radicals and a wavelength-averaged quantum yield of 0.002 was obtained for crude oil diluted with toluene. DBS, TME and alpha-terpinene were used as probes for singlet oxygen in toluene and pure oil films on water. Singlet oxygen quantum yields of 0.5-0.8 were obtained in toluene and 3 orders of magnitude lower in pure oil films on water. The mechanism of oxy radical formation is discussed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-936X
1520-5851
DOI:10.1021/es00178a003