Troubleshooting with cell blanks in PLE extraction.
The blank extracts obtained from the pressurized liquid extraction (PLE) of a 11 mL empty cell of ASE 200 were analysed by GC-FID and GC-ECD and many interfering peaks were detected, which could difficult the trace analysis of persistent organic pollutants (i.e. polycyclic aromatic hydrocarbons, aliphatic hydrocarbons and organochlorine pesticides). These interfering compounds were identified as phthalates, silicones and organic acids and their sources were established. A solution to this analytical trouble is a previous extraction step of the empty cell under the same conditions optimised for the sample extraction.
Fernández-González
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Department of Analytical Chemistry, University of A Coruña, Campus da Zapateira, 15071, A Coruña, Spain.
Grueiro-Noche
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G
Concha-Graña
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E
Turnes-Carou
M I
MI
Muniategui-Lorenzo
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S
López-Mahía
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P
Prada-Rodríguez
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D
D002264:Carboxylic Acids / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D006838:Hydrocarbons / Q000032:analysis*; D006843:Hydrocarbons, Chlorinated / Q000032:analysis; D008904:Miniaturization; D010575:Pesticides / Q000032:analysis*; D010795:Phthalic Acids / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012828:Silicones / Q000737:chemistry; D013997:Time Factors
D002264:Carboxylic Acids; D004785:Environmental Pollutants; D006838:Hydrocarbons; D006843:Hydrocarbons, Chlorinated; D010575:Pesticides; D010795:Phthalic Acids; D011084:Polycyclic Aromatic Hydrocarbons; D012828:Silicones