电感耦合等离子体质谱法测定小麦粉13种重金属元素

为建立电感耦合等离子体质谱法测定小麦粉13种重金属元素含量的方法,以4种小麦粉为试材,用微波消解法对样品进行前处理,利用电感耦合等离子体质谱仪进行测定。结果表明:该方法检出限为0.022~0.670 μg/L,各元素标准曲线相关系数高于0.9992,相关性良好;元素加标回收率在88.00%~107.38%之间;4种样品Al、Mn、Fe、Co、Ni、Cu、Zn、Se的检出平均值在0.004~8.615 mg/kg之间,Ag、Cr、As检出值分别为0.186、0.142、0.015 mg/kg,Cd、Pb均未检出,盲检样所检出元素含量均在所给定范围内。该法具有检测快捷、灵敏度高、精确度良好、结果准确的特点,可为小麦粉重金属检测提供参考。

Determination of 13 Kinds of Heavy Metal Elements in Wheat Flours by Inductively Coupled Plasma Mass Spectrometry

To establish a method for simultaneous determination of 13 heavy metal elements in wheat flours,heavy metal contents were determined by inductively coupled plasma mass spectrometry using 4 kinds of wheat flour as materials. The samples were pretreated by microwave digestion. The results showed that the limits of detection were ranged from 0.022 to 0.670 μg/L and the correlation coefficient of standard curve in each element was greater than 0.9992 with well correlation. The recoveries ranged from 88.00% to 107.38%. The average detection values of aluminum,manganese,iron,cobalt,nickel,copper,zinc and selenium in the four samples ranged from 0.004 to 8.615 mg/kg. The values of silver,chromium and arsenic were 0.186,0.142 and 0.015 mg/kg,respectively,while cadmium and lead were not detected. The element contents detected in the unknown sample were all within the given range. This method with the characteristics of rapid detection,high sensitivity,better precision and accurate results could provide reference for the monitoring of heavy metal pollution in wheat flour.