Abstract: In acid medium with ethanol, copper单位 Ⅱ)、 PAN and cetyl trimethyl ammonium bromide单位 CTMAB) could form a stable multi－micelle complex with the maximum absorption wave length at 520 nm. Lambert－Beer law was well obeyed for the copper单位 Ⅱ) concentration in ranging of 2.0~60.0 μg／L. Regression equation was y＝0.0059x＋0.0048, which with correlation coefficient r=0.9982 and the apparent molar absorptivity ε=2.0×104 L／mol／cm. The relative standard deviation was less than 2.50％. The proposed method was used in the determination of trace copper in food, and the results were in consistent with the results obtained by flame atomic absorption spectrometry.

Key words: copper单位 Ⅱ), organic solvent, CTMAB, sensitized, spectrophotometry