流动注射-导数火焰原子吸收光谱测定植物油中的铜、锌

提出了流动注射 导数火焰原子吸收光谱测定植物油中的微量铜和锌的新方法。流动注射进样技术克服了常规火焰原子吸收法耗样量大和基体干扰严重的缺点。导数技术应用于火焰原子吸收可提高方法的灵敏度和信号的选择性。流动注射与导数技术相结合应用于火焰原子吸收成功地测定了植物油中的微量铜和锌。铜和锌的特征浓度分别为 0 0 0 4 0 ,0 0 0 12 μg·mL-1,相对标准偏差在 1 1%～ 5 1%的范围内。

Determination of Trace Copper and Zinc in Vegetable Oils by Derivative Flame Atomic Absorption Spectrometry Combined with Flow-Injection Technique

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 microg x mL(-1) for copper and zinc, respectively, and the relative standard deviation was 1.1% -5.1%.