Abstract:The method for the determination of silver, boron, tin, molybdenum, lead in geochemical samples by ACArc direct reading atomic emission spectroscopy was studied in this paper. K2S2O7, NaF, Al2O3 and carbon powder are prepared for buffers. Ge is used as internal standard element. Suitable analytical line pairs were selected, and the interception exposure time is 25s. The background of analytical lines and the internal standard line are corrected at the same time. National standards substances (GBW07103、GBW07104、GBW07107、GBW07312、GBW07302a、GBW07304a、GBW07305a、GBW07307a、GBW07406、GBW07446、GBW07454、GBW07456) were selected as standard series, and the standard curves are fitted with quadratic curve of the logarithmic coordinate. Each sample is parallelly analyzed two times, and the average value is taken as the result. The detection limits for Ag, B, Sn, Mo, Pb are 0.011×10-6 0.54×10-6, 0.19×10-6, 0.034×10-6, 0.66×10-6, respectively. The precisions (RSD, n=12) for Ag, B, Sn, Mo, Pb are 4.01%~8.33%, 3.77%~7.86%, 2.94%~8.17%, 3.03%~10.94%, 2.01%~11.11%, respectively. The analytical accuracy was validated by national standards substances of rocks, stream sediments and soils, the results were agreement with certified values. The method, which is convenient in operation and high in working efficiency, is a new analytical method for the determination of silver, boron, tin, molybdenum, lead in geochemical samples, and can be popularized to the determination of geochemical samples in large quantities.