Abstract: A graphite furnace atomic absorption spectrometry (GFAAS) method was established to determine the amount of tin in foods under the condition of closed vessel digestion. Samples were subjected to determination at ashing temperature of 1000 ℃ and atomization temperature of 1800 ℃ using PdCl2 and Mg(NO3)2 as the matrix modifiers. Under the optimal determination conditions, an excellent linear relationship was observed in the concentration range of 0.05－0.20 mg/L. The detection limit, recovery rate and accuracy of this developed method were 6.7μg/L, 99.2%－104.4% and 4.3%, respectively. Therefore, this developed method is characteristics of simple operation, high accuracy and excellent sensitivity so that it can meet the requirement for the determination of tin in foods with low concentration.

Key words: high pressure wet digestion, graphite furnace atomic absorption spectrometry, tin