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A sensitive technique for the determination of trace Cu(II) in various samples after the columnpreconcentration by adsorbing its N-benzoylphenylhydroxylamine (BPHA) onto benzophenone was developed.amount of benzophenone, and the flowrate of sample solution and so forth were optimized. The interferingeffects of diverse concomitant ions were investigated. Fe(III) and CN interfered with more seriously than anyvolume of 0.01M BPHA to 10 mL. The dynamic range, the correlation coefficient (R2) and the detection limitobtained by this proposed technique were 5.0~120 ng/mL, 0.9974, and 2.1 ng/mL, respectively. For validatingthis proposed technique, the aqueous samples (stream water, reservoir water, and wastewater), the plastic sampleand the diluted brass sample were used. Recovery yields of 93~102% were were not different from ICP-MS data at 95% confidence level. This method was also validated by the riceflour CRM (normal, fortified) samples. Based on the results from the experiment, it was found that this proposedtechnique could be applied to the determination of Cu(II) in various real samples.