Air/polymer distribution coefficients for polycyclic aromatic hydrocarbons by solid-phase microextraction sampling

• Published in: Journal of Chromatography A 2004-03, Vol.1029 (1), p.263-266
• Main Authors: Kolář, Kamil, Ciganek, Miroslav, Malecha, Jiřı́
• Format: Article
• Language: English
• Subjects: Air; Air - analysis; Analysis methods; Analytical chemistry; Applied sciences; Atmospheric pollution; Calibration; Chemistry; Chromatographic methods and physical methods associated with chromatography; Distribution coefficients; Exact sciences and technology; Gas chromatographic methods; Pollution; Poly(dimethylsiloxane); Polycyclic Compounds - analysis; Polymers - chemistry; Polynuclear aromatic hydrocarbons; Reproducibility of Results; Solid-phase microextraction
• ISSN: 0021-9673
• DOI: 10.1016/j.chroma.2003.12.007

Two methods to estimate distribution coefficients ( K) between air and poly(dimethylsiloxane) (PDMS) coating of solid-phase microextraction (SPME) fibers for eight low molecular polycyclic aromatic hydrocarbons (PAHs) there are presented. The PDMS phases were used for determination of the coefficients according to equilibrium theory with help of a developed static calibration system (SCS). Another way to estimate the coefficients is based on the use of a linear relationship between the logarithm of the coefficients (log K) and linear temperature–programmed retention indexes (LTPRI) of the compounds without necessity to calibrate. The log K values for both of methods ranged from 5.2 (naphthalene) to 8.9 (pyrene) at 22 °C. Relative standard deviation (R.S.D.) of log K for each compound determined by static calibration was no more than 5.3%. R.S.D. of retention times for LTPRI indices did not exceed 0.28% for repeated injection. All experiments were implemented on a GC–MS system.