 ISSN 0235-7216 ISSN 2424-4538 (online) |
2009 m. Nr. 4 Gas chromatographic analysis of cresols in aquatic solution by solid phase microextraction
A simple and sensitive method for analysis of a mixture of cresol isomers in aquatic solution was developed using headspace solid-phase microextraction (HS-SPME) and gas chromatography with flame ionization detection (GC-FID). Separation of o-, m- and pcresols in mixture was performed on an Elite Wax column. The effect of temperature, time and sodium chloride on cresol extraction as well as the effect of temperature and time on the desorption of the compounds was established. The following conditions were revealed to be optimal: headspace extraction at 40 °C for 60 min in the presence of 0.3 g/mL of sodium chloride and desorption at 210 ºC for 60 s. Detection limits for o-cresol, m-cresol and p-cresol were established to be 0.68, 0.96 and 1.31 μg/L, respectively, when PDMS-DVB fibre was used. The relative standard deviation (RSD) of the measurements was ≤ 5.9%. The dose–response relationship was linear within the range 1.5 to 10.0 mg/L (R2 = 0.997). Keywords: phenolics, headspace, GC-FID, SPME, optimisation |
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