Abstract：A new method was proposed to determine trace copper and zinc in vegetable oils by derivative flame atomic absorption spectrometry combined with flow-injection technique. The flaw that sampling is large and matrix interference was serious in conventional Flame Atomic Absorption Spectrometry(FAAS) was overcome by flow-injection sampling technique. The sensitivity and signal selectivity were enhanced when derivative technique was used in flame atomic absorption spectrometry. The results of determinations of copper and zinc in vegetable oils were satisfactory by derivative flame atomic absorption spectrometry combined with flow-injection，which were not done by conventional FAAS or flow-injection FAAS. The sensitivities were 0.004 0 and 0.001 2 μg·mL-1 for copper and ｚinc，respectively，and the relative standard deviation was 1.1%-5.1%.
[1] Zalts A et al. An. Asoc. Quim. Agent，1986，74(1)：50. [2] Hon P K et al. Analytica Chimica Acta，1980，113：175. [3] Hoequeuet P. Atomic Spectrosc.，1985，6(3)：69. [4] Sun H J. Am. Oil Chem. Soc.，1989，66(4)：549. [5] TAO Ｒｕi，PENG Ｘi-ｙｕ(陶 锐，彭喜雨). Chinese J. of Spectroscopｙ Laboratorｙ(光谱实验室)，1993，10(1)：1. [6] CHEN Shｕ-ｙｕ，LIN Shｕ-ｘin(陈树榆，林淑欣). Chinese J. of Anal. Chem.(分析化学)，1988，16(5)：460. [7] Calapa J R et al. Atomic Spectrosc.，1988，9(4)：107. [8] Mason T J et al. Pure Applied Chemistry, 1988, 60: 893.
