Development of a Method for the Isomer-Specific Determination of PCDDs/PCDFs in Leachate-Oil Extracts of a Waste Landfill

摘要

A clean-up procedure for the isomer-specific analysis of polychlorinated dibenzodioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in oil extracts from water leachate of a hazardous waste landfill is described. Sample pretreatment was performed by ultrasonics or by ultrasonics and subsequent refluxing with toluene. The clean-up procedure consists of four basic steps: 1. Chromatography on Alumina B-Super I (macro-column). 2. Chromatography on silica gel combined with silica gel44% conc. H sub 2 SO sub 4 . 3. Flash chromatography on Bio-Beads S-X3. 4. Separation of 2,3,7,8-tetra-CDD and final sample purification on Alumina B-Super I (micro-column). Except for 2,3,7,8-tetra-CDF, all the 2,3,7,8-substituted PCDDsPCDFs could be detected. Among the 2,3,7,8-tetra-to hexa-CDDsCDFs, 2,3,7,8-TCDD was by far the most abundant isomer, determined at a mean concentration of 70,5 ppb. Industrial wastes from 2,4,5-trichlorophenol production are assumed to be the main source for this high concentration. From the isomer-specific analysis of the hepta-CDFs, pentachlorophenol can be considered as source of the higher chlorinated PCDDsPCDFs. (ERA citation 13:034446)