Extraction and Clean-Up Procedures for Measuring Chlorobenzenes in Sediments and Fish by Capillary Gas Chromatography

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Abstract
A soxhlet extraction technique for recovering chlorobenzenes from sediments and fish was described. The extract was concentrated by evaporation, cleaned up with florisil (sediments) or a combination of alumina, silica gel, florisil and acidified silica gel (fish) before quantitation by capillary gas chromatography with an electron capture detection. Recoveries for all chlorobenzenes were > 80%. Detection limits of the technique are .apprx. 0.05 ng/g (ppb) for penta- and hexachlorobenzene, .apprx. 0.2 ppb for the tetrachlorobenzenes, .apprx. 0.4 ppb for the trichlorobenzenes, .apprx. 5 ppb for the dichlorobenzenes and .apprx. 1500 ppb for monochlorobenzene.