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A flow injection analysis (FIA) system incorporating a microcolumn of activated alumina was used for the determination of molybdenum by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The transient signal resulting from the injection of molybdenum was determined by a spectrally segmented photodiode-array spectro-meter. Linear calibration was established for molybdenum over a concentration range 0 - 1000 ng/ml. The detection capability was approximately 50 times better than offered by comparable continuous- nebulization systems. The detection limit for molybdenum was 0.2 ng/ml, and the relative standard deviations at 500 and 10 ng/ml were about 2 and 5%, respectively. The ability of the multichannel photodiode array spectrometer to correct for background shifts which occur during signal integration period provided improved precision and accuracy. Application to the analysis of molybdenum in standard sea water (NASS-2) was demonstrated. Flow injection analysis, Preconcentration, Inductively coupled plasma, Multielement analysis, Photodiode array spectrometer.