Photolysis of polychlorinated dibenzo-p-dioxins and dibenzofurans dissolved in vegetable oils:: influence of oil quality

被引:13
|
作者
Isosaari, P
Laine, O
Tuhkanen, T
Vartiainen, T
机构
[1] Natl Publ Hlth Inst, Dept Environm Hlth, FI-70701 Kuopio, Finland
[2] Tampere Univ Technol, FI-33101 Tampere, Finland
[3] Univ Kuopio, Dept Environm Sci, FI-70211 Kuopio, Finland
关键词
degradation products; hydrogen donor; photodegradation; sensitizer; UV;
D O I
10.1016/j.scitotenv.2004.08.007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sunlight or ultraviolet light irradiation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the presence of vegetable oil offers a potential method for the cleanup of contaminated soil. In this study, the effects of different types of vegetable oils on the photochemical degradation of 1,2,3,4,6,7,8-heptachlorodibenzofuran and heptachlorodibenzo-p-dioxin (1,2,3,4,6,7,8-HpCDF/HpCDD) were investigated in the laboratory. Using a blacklight lamp as a source of ultraviolet light, 93-100% of 1,2,3,4,6,7,8-HpCDF degraded in 60 min in rapeseed oil, extra virgin olive oil and olive oil. Less degradation occurred in palm oil (59%), toluene (39%) and hexane (20%). The better degradation in vegetable oils in comparison with organic solvents was attributed to the photooxidation of lipids producing hydrogen for PCDD/F dechlorination. In addition to the hydrogen donor capacity, permeability of ultraviolet light was involved in the differences between vegetable oils. a-Tocopherol and chlorophyll did not influence the performance of oil at concentrations normally present in vegetable oils, whereas beta-carotene had an inhibitory effect on the degradation of 1,2,3,4,6,7,8-HpCDF. Up to 28% of the degradation products of 1,2,3,4,6,7,8-HpCDF were formed via the dechlorination pathway. Products included both toxic (2,3,7,8-chlorinated) and nontoxic PCDD/Fs, the toxic PCDD/Fs being more stable. Irradiation of 1,2,3,4,6,7,8-HpCDD yielded only non-toxic dechlorination products. Polychlorinated hydroxybiphenyls (OH-PCBs), polychlorinated dihydroxybiphenyls (DOH-PCBs) and polychlorinated hydroxydiphenylethers (OH-PCDEs) containing one to seven chlorine atoms were not detected in irradiated HpCDF/HpCDD samples. (c) 2004 Elsevier B.V. All rights reserved.
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页码:1 / 11
页数:11
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