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微波消解—ICP-MS法测定坚果和果蔬籽仁中As、Pb、Hg、Mg、Al含量
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Determination of As, Pb, Hg, Mg and Al content in nuts and fruit and vegetable seed kernels by closed microwave digestion-ICP-MS
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    摘要:

    为了建立密闭式微波消解—ICP-MS法同时测定坚果与果蔬籽仁中As、Pb、Hg、Mg、Al含量的方法。采用微波消解仪对坚果与果蔬籽仁样品进行密闭消解,然后用电感耦合等离子体质谱分析仪,以72Ge作为As的内标、209Bi作为Pb和Hg的内标、45Sc作为Mg和Al的内标控制分析信号的动态漂移,对坚果与果蔬籽仁中的As、Pb、Hg、Mg、Al进行同时测定。结果表明:As、Pb、Hg、Mg、Al的回收率在95%~105%之间;As、Pb、Hg、Mg、Al的检出限分别为0.005、0.005、0.001、0.01、0.005 mg/kg;线性相关系数均大于0.999 9;相对标准偏差(RSD)均小于2%。同时对国家标准物质大米进行分析,结果测定值在标准值范围内。本法回收率、检出限、准确度、精密度试验的结果均满足要求,可用于测定坚果与果蔬籽仁中As、Pb、Hg、Mg、Al含量,并为完善坚果与果蔬籽仁质量标准提供依据。

    Abstract:

    A closed microwave digestion- ICP-MS method was established to determine simultaneously As, Pb, Hg, Mg, Al content in nuts and fruit and vegetable seed kernel. The samples were digested with microwave digestion instrument and analyzed by inductively coupled plasma mass spectrometer, 72Ge as an internal standard of As, 209Bi as an internal standard of Pb and Hg, 45Sc as the internal standard of Mg and Al to control the dynamic drift of the analytical signals, As, Pb, Hg, Mg, Al content in nuts and fruit and vegetable seed kernel were determined simultaneously. The results showed that the recoveries of As, Pb, Hg, Mg, Al between 95%~105%; the detection limits of them were 0.005 mg/Kg, 0.005 mg/Kg, 0.001 mg/Kg, 0.01 mg/Kg, 0.005 mg/Kg; all of the linear correlation coefficient more than 0.999 9; RSD less than 2%. The results, recovery, detection limit, accuracy and precision, met the requirements of the determination of As, Pb, Hg, Mg, Al content in nuts and fruit and vegetable seed kernels, which provided a basis for quality standards of nuts and fruit and vegetable seed kernel.

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蓝长波.微波消解—ICP-MS法测定坚果和果蔬籽仁中As、Pb、Hg、Mg、Al含量[J].粮油食品科技,2014,22(5):58-61.

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  • 在线发布日期: 2014-10-13
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