Preparation and evaluation of solid-phase microextraction fibres based on functionalized latex nanoparticle coatings for trace analysis of inorganic anions.

The use of a functionalized latex nanoparticle coating as a new sorbent phase for solid-phase microextraction (SPME) was examined. By means of electrostatic absorption onto ionized silanol groups, a fused-silica rod was coated with polymeric nanoparticles functionalized with quaternary ammonium groups. Optimum conditions for the preparation of the coated fibre are presented. The fibre was used for the extraction of a mixture of seven anions from water samples which are analysed by coupling the SPME fibre to an ion chromatographic system via a special interface. The results obtained proved the suitability of this novel coating as a new SPME fibre. A linear calibration for the target analytes was achieved over the concentration range from 5 microg L(-1) to 5 mg L(-1) (r(2)>0.988), while limits of detection for these ions were all below 3.7 microg L(-1) (S/N=3). The reproducibility of a single fibre (n=4) under similar conditions was between 7 and 12%, while the fibre to fibre reproducibility (n=5) was between 8.9 and 14%.