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Supercritical fluid extraction of 2,3,7,8-tetrachlorodibenzo-p-dioxin from sediment samples

✍ Scribed by Onuska, F. I. ;Terry, K. A.

Publisher: John Wiley and Sons
Year: 1989
Tongue: English
Weight: 440 KB
Volume: 12
Category: Article
ISSN: 0935-6304
DOI: 10.1002/jhrc.1240120603

No coin nor oath required. For personal study only.

✦ Synopsis

Supercritical fluid extraction (SFE) is a promising technique for the extraction of 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7, from environmental matrices such as contaminated sediments.The abilityof SFE to solubilire many organic contaminants is well documented in industrial processes but its analytical applications were exploited just recently. In this study, supercritical carbon dioxide and nitrous oxide and their mixtures with 2% methanol were used to extract 2,3,7,8-TCDD from aquatic sediments. An attractive feature of this process is that the carbon dioxide, being a virtually inert fluid, leaves no solvent residue on the processed sediment. Almost 100% of the 2,3,7,8-TCDD can be extracted from a sediment spiked with 200 pg/kg 2,3,7,8-TCDD in 30 minutes by using supercritical carbon dioxide + 2% methanol.

Cleanup procedure is compared with the Soxhlet extraction procedure currently used as a standard method for extracting dioxins from sediment samples.

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