Solid-phase microextraction with on-fibre derivatisation applied to the analysis of volatile carbonyl compounds

We have used a fast, sensitive and efficient method for the analysis of vol atile carbonyl compounds (saturated aliphatic and unsaturated aldehydes) ba sed on solid-phase microextraction with on-fibre derivatisation. Pentafluor ophenylhydrazine was absorbed onto a poly(dimethylsiloxane)/divinylbenzene- coated and exposed to the vapours of aldehyde-containing matrices. The hydr azones formed on the fibre were desorbed into the gas chromatograph injecti on port and quantified by means of electron-capture detection with high sen sitivity (10-90 fmol) and good reproducibility (RSD<10%). The method was ap plied to the headspace-sampling of volatile carbonyl compounds released dur ing the thermally-induced degradation of sunflower oil. (C) 2000 Elsevier S cience B.V. All rights reserved.