微波消解-氢化物原子荧光光谱法测定农产品中铅
Hydride Generation-Atomic Fluorescence Spectrometric Determination of Lead in Agricultural Product with Micro-Wave Assisted Sample Digestion
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摘要: 建立了微波消解-氢化物原子荧光光谱法测定农产品中铅含量的分析方法,对仪器条件和反应条件进行了选择、优化.方法的检出限为0.80 μg·L-1,相对标准偏差小于10%,回收率为94.0%~113.5%.该方法具有试剂用量少、检测快速、基体干扰小、准确度高等优点,符合农产品中痕量元素的分析要求.Abstract: Hydride generation-atomic fluorescence spectrometric method was applied to the determination of lead in agricultural products.The sample was dissolved with HNO3 and H2O2 in a tightly closed PTFE vessel and heated in a microwave oven under prescribed program.The sample solution was evaporated to near dryness and taken up with HCl(5+95).An intermittent flow hydride generation manifold was used in the generation of PbH4 and for separation of the gaseous mixture from the solution.Working conditions of the instrument and conditions of chemical reaction tested and optimized.Detection limit (S/N=3) of the method was 0.80 μg·L-1 Tests for precision and recovery were made,giving values of RSD′s (n=8) less than 10%,and recoveries in the range of 94.0%-113.5%.