Abstract:In this paper a method for determination of tin in chemical samples by alternating current arc emission spectrometry was described. Zinc oxide, sodium fluoride and sulfur were used as buffer to improve the evaporation behavior of elements, and germanium was used as internal standard. The ratio of sample to buffer was 1:1. According to different content of tin, different levels of sensitive lines were selected for analysis. The internal standard method was adopted to establish the linear relationship between the concentration and relative strength, and to calculate the content of tin in the sample. This method can increase the upper limit of tin analysis to x%, and avoid the analysis error caused by diluted sample. The Relative Standard Deviations (RSD, n=12)is all less than 7%,The method was validated by the determination of the national geochemical standard reference materials, and the result was in agreement with the standard value.