食品科学 ›› 2013, Vol. 34 ›› Issue (8): 168-171.doi: 10.7506/spkx1002-6630-201308035

• 分析检测 • 上一篇    下一篇

超声波提取-原子吸收光谱法测定谷物中镉、铜、铅和锌的含量

顾佳丽,赵 刚,马占玲   

  1. 渤海大学化学化工与食品安全学院,辽宁 锦州 121013
  • 收稿日期:2011-12-19 修回日期:2013-03-08 出版日期:2013-04-25 发布日期:2013-05-07
  • 通讯作者: 顾佳丽 E-mail:gujiali@yahoo.cn
  • 基金资助:
    国家自然科学基金项目;辽宁省自然科学基金;辽宁省教育厅重点实验室项目

Determination of Cadmium, Copper, Lead and Zinc in Grains by Ultrasound-Assisted Extraction Followed by Atomic Absorption Spectrometry

GU Jia-li,ZHAO Gang,MA Zhan-ling   

  1. College of Chemistry, Chemical Engineering and Food Safety, Bohai University, Jinzhou 121013, China
  • Received:2011-12-19 Revised:2013-03-08 Online:2013-04-25 Published:2013-05-07

摘要: 优化超声波辅助提取-原子吸收光谱法测定大米等谷物中Cd、Cu、Pb和Zn含量的方法。结果表明:0.1g谷物(粒径<50μm)中加入5mL HNO3 -H2O2溶液(2:1,v/v),先预超声10min,再放入60℃超声水浴中超声提取10min后,Cd、Cu、Pb和Zn均可以被定量回收,加标回收率在96.0%~107.5%之间。t检验结果表明超声提取法与常规湿式消解法分析结果差异不显著。方法的相对标准偏差(RSD)为4.9%~7.0%,检出限为0.007~0.019mg/L。

关键词: 超声提取法, 金属元素, 谷物

Abstract: Determining of cadmium, copper, lead and zinc in grain using ultrasound-assisted extraction- atomic absorption spectrometry was optimized. The results indicated that 0.1 g of grain samples were treated with 5 mL of HNO3-H2O2 (2:1, V/V) followed by 10-min presonication and then transferred to ultrasound water bath (60 ℃) for 10 min. Cd, Cu, Pb, and Zn can be quantitatively recovered and the spiked recoveries ranged within 96.0%–107.5%. The results of t-test indicated that difference in the results from ultrasound-assisted extraction and conventional wet acid digestion was not significant. The relative standard deviations (RSD) were 4.9%–7.0%, the limits of detection were 0.007–0.019 mg/L.

Key words: ultrasound-assisted extraction, metallic elements, grain

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