脉冲喷雾火焰原子吸收光谱法测定牛乳中微量锌

Determination of Trace Zinc in Milk Using Pulse Nebulization Atomic Absorption Spectrophotometry Technique

本文介绍了应用脉冲喷雾技术和原子吸收法直接测定牛乳中锌的方法。探讨了进样体积、提升量及其他因素的影响。牛乳试样经５倍稀释后直接测定，避免了常规火焰原子吸收法测试需将样品消化的繁琐手续。该法与消化后常规法测定结果一致。

A rapid,diect,pulse nebulization method for the determination of trace zinc in milk by FAAS with model WYX 402A atomic absorption spectrometer is described.The influence of pulse nebulization volume,uptake rate of solution and other factors on the uptake signal has been discussed.The milk sample was diluted with 1 5% HCl solution.A 100μL aliquot of the solution was then nebulied and the peak height of the transient output pulse was monitored.The result of the determination of the 1+4 diluted sample is in agreement with that of digested sample with HNO 3 HClO 4.The average recovery of 99 0% with relative standard deviation of 3 3% was achieved and the detection limit was 0 028 μg/mL.The method is simple,rapid,accurate and precise.