2013•Physical Testing and Chemical AnalysisRequires access
HG-AFS Determination of Tin in Canned Food with Microwave Assisted Sample Digestion
Zhou Xu-dong
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Abstract
AFS was applied to the determination of Sn in canned food.The sample was digested with HNO3 and H2O2,and 20 g·L-1 KBH4 solution(dissolved in 5 g·L-1 KOH solution) was added to the sample solution as reductant.Flow-rates of 400 mL·min-1 for carrier gas and 900 mL·min-1 for shielding gas were taken in the analysis.Linear relationship between the fluorescence intensity and mass concentration of Sn found was in the range within 200 mg·L-1,with detection limit(3s) of 0.005 mg·kg-1.The proposed method was applied to the analysis of samples of canned food,giving values of recovery obtained by standard addition method in the range of 102%-108% and RSD′s(n=7) in the range of 1.4%-2.0%.