Extraction of PCDD/PCDF from soil with supercritical CO2: optimization by a three-level factorial design approach.
Two factors (pressure and temperature) varied over three levels were optimized for the extraction of PCDD/F from native contaminated soil with toluene-modified supercritical carbon dioxide. Temperature had a strong positive effect on the recovery. The most efficient extraction was achieved at 120 degrees C. This is in contrast to the influence of the temperature on the extraction of HCH, where a higher recovery is obtained at 60 degrees C than at 150 degrees C. The optimized conditions found for this soil were applied to the analysis of a BCR (European Commission) reference material prepared from contaminated industrial soil. The results are in good agreement with those of an interlaboratory study.
Institut Fresenius, Labor Hamburg, Germany.
C
C
von Holst
G
G
Maio
B W
BW
Wenclawiak
R L
RL
Darskus
D001572:Benzofurans / Q000032:analysis / Q000302:isolation & purification*; D002245:Carbon Dioxide / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D007220:Industrial Waste / Q000032:analysis; D008722:Methods; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification*; D011312:Pressure; D012015:Reference Standards; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*; D013696:Temperature
D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D007220:Industrial Waste; D000072317:Polychlorinated Dibenzodioxins; D012987:Soil; D012989:Soil Pollutants; D002245:Carbon Dioxide