Comparison of supercritical fluid and Soxhlet extractions for the isolation of nitro compounds from soils.
Supercritical fluid extraction (SFE) with CO(2), a clean and rapid alternative to conventional Soxhlet extraction, was investigated for the extraction of nitro compounds from soil samples. Quantitative extraction by SFE was accomplished at a pressure of 25 MPa and an extraction temperature of 60 degrees C, for 30 min in dynamic mode and using acetonitrile as modifier, and the results were comparable with those obtained by acetonitrile Soxhlet extraction (3 h) for all soil samples. Extracts from these two procedures were analyzed by gas chromatography coupled with mass spectrometry. Quantitative reproducibility for SFE extracts was acceptable (RSD 2-10%), and the quantity of solvent was reduced from 160 mL for Soxhlet extraction to 5 mL in the case of SFE.
Bajerová
Petra
P
University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Pardubice, Czech Republic. petra.bajerova@upce.cz
Eisner
Ales
A
Jezová
Vera
V
Adam
Martin
M
Ventura
Karel
K
D000096:Acetone / Q000032:analysis; D000097:Acetonitriles / Q000032:analysis; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002849:Chromatography, Gas / Q000379:methods; D025924:Chromatography, Supercritical Fluid / Q000379:methods*; D013058:Mass Spectrometry / Q000379:methods; D000432:Methanol / Q000032:analysis / Q000737:chemistry; D009574:Nitro Compounds / Q000032:analysis / Q000302:isolation & purification*; D011312:Pressure; D015203:Reproducibility of Results; D012987:Soil / Q000032:analysis*; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013997:Time Factors
D000097:Acetonitriles; D009574:Nitro Compounds; D012987:Soil; D012997:Solvents; D000096:Acetone; D000432:Methanol; C032159:acetonitrile