Abstract：The elements of silver, tin and boron in geochemical sample are usually determined by arc atomic emission spectrometry. However, the conventional analysis method requires phase plate record and quantitative spectra interpretation by computer. The analytical procedures are complicated, and the results are greatly influenced by phase plate quality and human factors. The refitted direct-reading CCD-I alternating current(AC) arc emission spectrometer was used for the rapid determination of trace silver, tin and boron in geochemical sample. The time-consuming operation procedures of phase plate record and spectra interpretation in conventional method were replaced, which improved the testing efficiency. The analysis method of silver, tin and boron in geochemical sample by AC arc emission spectrometry was established. The influence of various buffer reagents and working conditions on the determination of silver, tin and boron was investigated. The mixture of K2S2O7, Al2O3, NaF, KI and carbon powder was used as solid buffer reagent. The internal standard method was selected with Ge as internal standard element. The proper analysis line pair were used to prepare the evaporation curves of elements with different excitation time. It was found that the optimal excitation time was 30 s. The matrix effect was eliminated by background detection of analysis line and internal standard line. The analytical results were good. The correlation coefficients of calibration curves of elements were not less than 0.999 0. The detection limit under optimal experimental conditions was as follows: 0.015 μg/g for silver, 0.45 μg/g for tin and 0.90 μg/g for boron. The precision test was conducted with seven national primary geochemical certified reference materials, and the relative standard deviations (RSD, n=12) were less than 10%. The proposed method was applied to the determination of national primary certified reference materials of rock, soil and stream sediments, and the results were consistent with the certified values.
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