Abstract
Lead is determined by using an on-line pre-concentration micro column of activated alumina and a flow-injection atomic absorption spectrophotometer. Samples of groundwater were collected from different locations around Tripoli. Results were obtained for a flow rate of 3.4 mL/min. Nitric acid concentration for eluting lead was 2 M. Ammonia solution was used as a carrier at a concentration of 0.15 M. Samples and standards were injected at pH 4.5 using an injection loop of 1000 µL. Lead was determined at a range of 0.2–8.1 µg/L with RSD 0.5%.