Coupling of SPME and GC-AED for the determination of organometallic compounds

The solid-phase microextraction (SPME) technique coupled with gas chromatog raphy and atomic emission detection was successfully applied for the determ ination of selected organometallic species of Pb, As and He in aqueous samp les. To obtain a high extraction yield, the SPME conditions were optimised for each element by fibre selection and varying the exposure time, stir-rin g rate, pH range and desorption time. All the organometallic compounds test ed were extracted from the aqueous phase using SPME. The preconcentration f actors attained ranged between 40 and 150, depending on the compound. Detec tion limits in the pg/L and ng/L ranges were achieved.