Journal
CHEMOSPHERE
Volume 301, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134587
Keywords
Photodegradation; Persistent organic pollutants; PCDD; Fs; PCBs; PBDEs; Fish oil
Categories
Funding
- Spanish Ministerio de Ciencia e Innovacion [AGL 2006-12235]
- Agencia de Gestio d'Ajuts Universitaris i de Recerca (AGAUR)
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This study found that various organic chlorides can be completely degraded under UV irradiation and has significant effects on removing organic pollutants from fish oil. However, its application for food oil is limited, yet it can still be used for the decontamination of industrial oils.
This study has investigated the photochemical degradation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs) and some organochlorine pesticides, such as hexachlorobenzene (HCB) or dichloro-diphenyl-trichloroethane (DDT) in hexane under UV irradiation at 254 nm. All pollutants were completely degraded after 3.5 h of exposition to the UV light. Moreover, this technique was applied to remove persistent organic pollutants from fish oil, with eliminations of a 34% for PCDD/Fs, 53% for PCBs, 59% for HCB, 67% for PBDEs and 73% for DDTs after 12 h of exposition to the UV light (254 nm). Dioxin-like PCBs increased their concentration after the treatment, probably due to the dehalogenation of other more chlorinated congeners. The fatty acids analysis of the fish oil revealed that the most important omega-3 fatty acids -EPA and DHA-were degraded to 67 and 70% of their initial content respectively. For these reasons elimination of persistent organic pollutants with photochemical treatment has limited applications for oils with food-purposes. However, it still can be a useful technique for decontamination of industrial oils.
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