SENSITIVE DETECTION OF IONIC ORGANOLEAD COMPOUNDS BY COUPLING HYDRIDEGENERATION (HG) WITH TRANSVERSELY HEATED GRAPHITE ATOMIZER ATOMIC-ABSORPTION SPECTROMETRY (THGA-AAS)

The detection of ionic alkyllead compounds using the coupling of flow injection analysis system-hydride generation (FIAS-HG) with transverse ly heated graphite atomizer atomic absorption spectrometry (THGA-AAS) has been worked out. Very low limits of detection can be achieved if t he hydride products are enriched in the graphite furnace. Under optimi sed conditions (concentration of sodium borohydride, hydrogen peroxide and acidity as well as the furnace temperature) calibrations are carr ied out in the range of 0.1 to 5 mug/L. With a 1.5 mL sample loop, the limit of detection is calculated to be about 7 ng/L, but it can be lo wered to below 1 ng/L if larger sample volumes are used for the enrich ment.