Polychlorobiphenyl , separation

The method described by Teichman et al. [15] and discussed in section 9.1.1.2 for the determination of chlorinated insecticides and PCBs in soils has also been applied to sediments. The procedure involves adsorption chromatography on alumina and charcoal, elution with increasing fractional amounts of hexane on alumina columns, and with acetonediethyl ether and benzene on charcoal columns. The polychlorobiphenyl and pesticides are then determined by gas chromatography on the separate elutes without interference. 

Benicka et al. [ 183] used multidimensional gas chromatography to separate the atropisomers of polychlorobiphenyl congeners in extracts of soil. The correct enanatiomeric ratio was determined from the peak areas obtained by deconvolution of the chromatograms. 

Lopshire [188] explored the exchange reaction of chlorine by oxygen with polychlorobiphenyl anions as a method of compound-selective polychloro-biphenyl congener detection in a gas chromatography-mass spectrometric system. Multiple reaction monitoring allowed separate chromatograms to be detected for each different polychlorobiphenyl composition from tetra-through nonachloro. 

For low volatility components such as polychlorobiphenyls or tetrachloro-para-dibenzodioxins (TCDD), it is possible to make use of a solvent effect in order to perform on-column enrichments. Thus, Poy [ 14 ] injected 4 times 2 pi of a sample containing TCDD isomers without destroying the separation performance. The low boiling components were stron y retained in the thick solvent layer formed when the solvent recondensed so that all 4 injections refocused in the column inlet before the chromatographic process took place. 

Fuoco R, Colombini MP, Samcova E. 1993. Individual determination of ortho and non-ortho substituted polychlorobiphenyls (PCBs) in sediments by high performance liquid chromatographic pre-separation and gas chromatography/ECD detection. Chromatographia 36 65-70. 

Leoni, V. et al.. Separation of pesticides, related compounds, polychlorobiphenyls and other pollutants into four groups by silica-gel microcolumn chromatography (application to surface water analysis). Pest. Sci., 31, 209,1991. 

Separation on column of pyrolytically deposited carbon Mechanism of transport of polychlorobiphenyl in rivers Selective analysis of penta-chlorobiphenyl isomers Computer-assisted production of GLC retention Indexes of polychlorobiphenyls Prediction of GLC retention characteristics of polychlorobiphenyls... 

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