Soxhlet extraction parameters’ influence on the recovery of polychlorinated dibenzo‐p‐dioxins and dibenzofurans (PCDD/F) from a sediment,and artifact formation of PCDD |
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| Authors: | Lars‐Owe Kjeller Christoffer Rappe |
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| Institution: | Institute of Environmental Chemistry , Ume? University , Ume?, S‐901 87, Sweden Phone: +46–90–166665 Fax: +46–90–166665 E-mail: lok@chem.umu.se |
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| Abstract: | Soxhlet extraction of polychlorinated dibenzo‐p‐dioxins/dibenzofurans (PCDD/F) from sediment was studied using a designed experimental set‐up. Three variables were studied: three solvent combinations n‐hexane/methanol, dichloromethane/acetone and toluene/methanol; two extraction times, 8 and 16 h, and addition of bulk substances (sodium carbonate). The extraction efficiency was almost identical in all extractions, with the exception of extraction where toluene/ methanol was combined with sodium carbonate. In these samples a major effect was observed, due to formation of Hx‐, Hp‐ and OCDD isomers. Composition of formed PCDD was similar to PCDD isomers found in pentachlorophenol products. |
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| Keywords: | Polychlorinated dibenzo‐p‐dioxins/dibenzofurans PCDD PCDF extraction Soxhlet sediment trace analysis analyte formation |
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