微乳液进样GFAAS法测定食用油中的铬

发布时间：2018-02-14 11:09

  本文关键词： 食用油 微乳液 石墨炉原子吸收光谱法 铬　出处：《食品研究与开发》2017年24期 　论文类型：期刊论文

【摘要】：建立微乳液直接进样-石墨炉原子吸收光谱法(graphite furnace atomic absorption spectrophotometry,GFAAS)测定食用油中铬的方法,研究微乳液的形成条件以及基体改进剂对测定结果的影响,优化石墨炉原子吸收光谱仪的升温程序,通过与微波消解处理样品的检测结果进行对比,验证方法的准确性。研究结果表明:按质量分数为15%食用油,6%水相,20%曲拉通X-100和59%正丁醇能配制成稳定的微乳液。不需要添加基体改进剂,仪器最佳检测条件为预灰化温度800℃、灰化温度1 400℃、原子化温度2 300℃。在此条件下,试验相对标准偏差5%,检出限为0.211 ng/m L,加标回收率在90%到110%之间,并与微波消解法处理样品的测量结果相近。该方法简单,准确,实用性强,并适用于大量食用油样品的测量。
[Abstract]:A method for the determination of chromium in edible oil by graphite furnace atomic absorption GFAAS-graphite furnace atomic absorption spectrometry was established. The formation conditions of microemulsion and the effect of matrix modifier on the determination results were studied. The temperature program of graphite furnace atomic absorption spectrometer was optimized and compared with the results of microwave digestion. The results show that the stable microemulsions can be prepared with 20% traxonium X-100 and 59% n-butanol at the mass fraction of 15%% water, and no matrix modifier is needed. The optimum detection conditions are as follows: preashing temperature 800 鈩，

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