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Chiral separation of PCBs, DDD and DDT by gas chromatography
1999 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

PCB, DDT and it’s metabolites, for example DDD, have ever since the 60th and 70th, respectively, been considered an environmental poison. Studies of these problematic organochlorines have shown properties like persistence and lipophility, which result in an accumulation in the fatty tissues in living organisms. It has also been shown that the biological properties of the enantiomers differ significantly. It is therefore very important to find a method that makes it possible to identify the different enantiomers. A stationary phase with the right properties is needed to manage the chiral separation of the enantiomers. Different modified cyclodextrins have been used. These have only showed separations of some of the nineteen stable PCB-congeners and have not always managed to separate DDT- or DDD-enantiomers. An attempt was made to mix these stationary phases and thereby be able to show separations on one column of all the enantiomers that been done earlier on different columns. The results still showed that columns containing a mix of the stationary phases gave good separations. Changing carrier gas and finding a more suitably method should result in better and even more separations. Instead of nitrogen, helium and hydrogen was used as carrier gases. These gases and an improved method resulted in better and more separations. Separations of PCB congeners that never have been separated on one of the included stationary phases before were also shown. On column B (mix of permethylated-*-cyclodextrin and heptakis(6-O-tert-butyl-dimethylsilyl-2,3-di-O-methyl)-*-cyclodextrin (25/25%)), column C (mix of permethylated-*-cyclodextrin and heptakis(6-O-tert-butyl-dimethylsilyl-2,3-di-O-methyl)-*-cyclodextrin (10/40%) and on column D (mix of permethylated-*-cyclodextrin and heptakis(2,3-di-O-tert-methyl-6-O-tert-hexyldimethylsilyl)-*-cyclodextrin (10/40%)) 10, 10 and 11 congeners respectively were separated.

Place, publisher, year, edition, pages
1999. , 64 p.
Identifiers
URN: urn:nbn:se:kau:diva-52626Local ID: KEM-9OAI: oai:DiVA.org:kau-52626DiVA: diva2:1101153
Subject / course
Chemistry
Available from: 2017-05-29 Created: 2017-05-29

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  • apa
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