Exploiting sequential injection analysis with bead injection and lab-on-valve for determination of lead using electrothermal atomic absorption spectrometry Original Research Article

Sequential injection (SI) with bead injection (BI) and lab-on-valve (L-O-V) was exploited for determination of trace lead using electrothermal atomic absorption spectrometry (ETAAS). A renewable microcolumn incorporated within the L-O-V system was investigated by using Sephadex G-25 impregnated by dithizone. Lead solution was passed through the impregnated beads. The beads were directly propelled into a graphite tube where they were pyrolyzed and lead ions were subsequently atomized. Conditions of the ETAAS measurement were studied including chemical modifiers (palladium, molybdenum and tartaric acid). The SI system for trapping of lead on the beads in the L-O-V could be operated in parallel to the ETAAS operation.