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A flow injection method has been developed for the determination of lead in environmental samples by use of on-line preconcentration on a Pb*SpecTM column and spectrophotometric detection. The lead in sample solutions was adsorbed selectively on the column from 1mol*l-1 nitric acid and the retained lead was eluted with 0.1mol*l-1 ammonium oxalate.4-(2-pyridylazo)resorcinol (PAR) was used as a chromogenic reagent at pH 10 and the absorbance of Pb-PAR complex was monitored at 530 nm. The pumps, valves and spectrophotometer were controlled by a personal computer. The detection limit (3σ) was 3ng of lead. The RSD is 1.7% at a level of 0.4μg lead. The proposed method was successfully applied to the determination of lead in fly ash of an incinerator for industrial waste and in river water certified reference material provided by the Japan Society for Analytical Chemistry.