Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Summary Remedial action at an industrial site contaminated with chlorinated organic compounds including PCDD/PCDF involves thermal treatment of soil to reduce levels of 2,3,7,8-TCDD below a target value of 60 ng/kg. To guarantee the required quick turnaround for the analyses, a problem-oriented method was developed for the selective determination of 2,3,7,8-TCDD on a time scale of 2 – 4 h. Treated soil is extracted with an acidic solvent mixture (ethoxyethanol/toluene/6 mol/l sulphuric acid). The 2,3,7,8-TCDD in the extract is separated from matrix components and other PCDD/PCDF congeners by flash chromatography on alumina. The selectivity attained in this step allows final determination using isotope dilution GC/MS on a non-polar column. The method is in routine operation in an on-site laboratory. With a bench top quadrupole instrument, detection limits around 3 – 5 ng/kg are obtained.
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