氢化物发生-原子荧光光谱法测定灵芝功能食品中的铅

Determination of lead in ganoderma lucidum functional foods by atomic fluorescence spectrometry

目的：建立一种用氢化物发生-原子荧光光谱法测定灵芝功能食品中铅的方法。方法：用原子荧光法测定铅的含量。样品经微波消解后,选择最佳的仪器条件和测定条件进行测定。结果：铅含量在0-10μg/L范围内呈现良好的线性关系,相关系数0.9997,最低检出限为0.017μg/L,取样量0.2000 g,最低检出浓度为0.0021μg/g,低、中、高3个浓度水平的相对标准偏差分别为5.4%、3.2%、1.5%,杨树叶标准物质（Pb的参考值1.5±0.3μg/g）的测得值为1.38μg/g。结论：用该法测定灵芝功能食品中铅的含量,方法的精密度和准确度及线性关系均比较满意,微波消解使样品消化具有快速、完全,且元素损失少、空白低等优点,大大提高了检测结果的准确性。

Objective：To establish a method for detection of lead in Ganoderma lucidum functional foods. Methods：Samples were digested with microwave digestion and determined for the concentration of lead by atomic fluorescence spectrometry in the best condition. Results： The calibration curve for lead was 0 - 10 ug/L, correlation coefficient 0.9997, detection limit 0. 017 ug/L. The RSD was 5.4% , 3.2% ,1.5% ,respectively. The measured value of poplar leaves about standard reference materials （Pb reference values of 1.5 ±0. 3 ug/g） was 1.38ug/g. Conclusion：The method for detection of lead is satisfied. The accuracy of the test results has been greatly improved.