Abstract：The determination method of fifteen components (As, Co, Cr, Cu, Fe2O3, K2O, Li, Mn, Mo, Na2O, Ni, Pb, Ti, V and Zn) in soil and stream sediment by inductively coupled plasma atomic emission spectrometry after microwave digestion was established. Several analysis lines of each element were compared and analyzed. The spectral lines with high intensity, good shape and little interference were selected as the analysis lines. The effect of acid for the dissolution of salts after microwave treatment and evaporation as well as the instrumental operation parameters of ICP-AES (such as carries gas flow and observation method) was studied. The researches indicated that the satisfactory results could be obtained under the following conditions: the sample was dissolved with mixed aqua regia and hydrofluoric acid; after solution evaporation, the salts were dissolved in 5 % (V/V) HCl; the RF power was 1 150 W; the flow rate of carrier gas was 0.6 L/min; the axial observation mode was adopted. The detection limits were between 0.06 μg/g and 49 μg/g. The proposed method was applied to the determination of certified reference materials of soil and stream sediment. The relative standard deviations (RSD) were less than 10%. The mean log errors between found results and certified values were less than 0.05, which could meet the requirements of <The specification of testing quality management for geological laboratories>.
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