HG-AFS Determination of Tin in Canned Food with Microwave Assisted Sample Digestion

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%.