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微波消解—电感耦合等离子体质谱法同时测定肉及肉制品中7种痕量元素

2015-06-16吴春敏等

肉类研究 2015年3期

吴春敏等

摘 要:建立采用电感耦合等离子体质谱法对肉及肉制品中铅、砷、镉、铬、硒、汞、镍7 种痕量元素同时检测的方法。用微波消解仪对肉及肉制品进行前处理,以铑作为内标,经电感耦合等离子体质谱仪针对7 种痕量元素进行测定。优化微波消解条件以及电感耦合等离子体质谱仪器测定条件。结果表明:内标法能克服仪器信号漂移及样品基体效应的影响。标准曲线的线性范围在0~20 ng/mL,回归方程的相关系数均大于0.999,各元素的加标回收率在89.4%~98.9%之间,相对标准偏差小于5%,检出限均低于国标方法中所规定的方法检出限。该方法具有快速、准确、可靠、灵敏度高及多元素同时分析等优点,可以满足批量肉及肉制品中铅、砷、铬、镉、硒、镍、汞检验和测定。

关键词:微波消解;电感耦合等离子体质谱;肉及肉制品;重金属

Abstract: A method for the simultaneous determination of 7 trace elements (lead, arsenic, cadmium, chromium, selenium, mercury, and nickel) in meat and meat products by inductively coupled plasma mass spectrometry (ICP-MS) with microwave digestion was established. Samples were pretreated by microwave digestion and determined by ICP-MS with rhodium (Rh) as the internal standard. The microwave digestion conditions and the instrumental parameters were optimized. It was found that the instrumental signal drift and matrix effect could be overcome by using the internal standard method. The developed standard curve was linear in the range of 0 to 20 ng/mL, with a correlation coefficient of more than 0.999. The recoveries of the analytes in spiked samples ranged from 89.4% to 98.9% and the precision expressed as relative standard deviation was less than 5%. The limits of detection for the trace elements were all lower than those stipulated in the Chinese national standards. The proposed method was rapid, accurate, reliable, sensitive and suitable for simultaneous multi-element analysis of meat and meat products.

Key words: microwave digestion; inductively coupled plasma mass spectrometry (ICP-MS); meat and meat products; heavy metal

中图分类号:TS254 文献标志码:A 文章编号:1001-8123(2015)03-0027-03

doi: 10.7506/rlyj1001-8123-201503007

人民生活水平日益提高的今天,食品安全问题已经成为人类共同关注的焦点,由于环境、运输、各种加工助剂污染造成各种食品的污染物含量超标问题也逐渐凸显,这其中尤以重金属污染为重[1-4]。重金属是指密度在

5×10-3 kg/m3以上的金属,主要包括汞(Hg)、镉(Cd)、铬(Cr)、铅(Pb)、砷(As)、锌(Zn)、锡(Sn)等[5-7]。肉及肉制品作为人类赖以生存的动物蛋白的良好来源,其食用安全性关系到千家万户的生命健康,其中重金属的污染也有众多途径[8],其一动物从环境中摄取的重金属通过食物链的生物放大作用,在较高级生物体内成千上万倍的富集起来,通……

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