Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
47, Number 2, February 2009, pp. 103-109
Uncertainty Measurement of Chlorophenols and
PCBs Analyzed in Aqueous Media by SPME–GC–ECD
S.L. Silva, A. Alves, and L. Santos
LEPÆ, Departamento de Engenharia Química, Faculdade
de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias,
4200-465 Porto, Portugal
Chlorophenols (CPs) and polychlorinated biphenyls
(PCBs) are two of the most important groups of high-priority
pollutants, due to their carcinogenicity, toxicity, and mutagenicity.
This paper compares the utilization of two solid-phase microextraction
(SPME) based extraction procedures, prior to gas chromatography
with electron capture detection (GC–ECD), to determine
PCBs (PCB 101 and PCB 153) and CPs (2,4,6-TCP and PCP) in aqueous
media. Good linearity was observed with the SPME–GC–ECD
method for the concentration range studied; detection limits
ranged from 0.5 to 1.0 µg/L. Repeatability was between
13% and 31% for the lowest concentration and between 5.6% and
7.8% for the highest concentration. The uncertainty was determined
by Thompson and bottom-up approaches. The identification of the
compounds was confirmed by GC–MS. The developed procedure
has the advantage of simplicity of sample treatment and avoids
the use of potentially hazardous organic solvents and the clean-up
or pre-concentration steps. Regarding PCBs, this procedure is
simpler and faster, but the limits of detection are higher.
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