Abstract：The spark source atomic emission spectrometry for the determination of Si, Fe, Mn and Mg is studied through evaluation of the sample preparations and establishment of the calibration curves. The influence of uniformity and cutting traces of the sample surfaces and cutting depth of the samples on determination are investigated. The results demonstrate that stable detecting results can be acquired on the condition of keeping the excited surfaces smooth without cutting traces (surface roughness Ra≤1.6 μm) and keeping cutting depth of the samples within 12 mm. The calibration curves established by virtue of the in-ductively coupled plasma atomic emission spectrometry(ICP-AES) which are confirmed by the chemical analysis can avoid matrix mismatch of the standards used to draw the calibration curves that have been established in the facility with the actual samples. The measuring ranges of Si, Fe and Mn are extended and the calibration curve of Mg is established with R2 of the curves above 0.995 totally. Moreover, the proposed method is applied to the determination of Si, Fe, Mn and Mg in sponge titanium and is compared with the ICP-AES. The results of t-test demonstrate that there is no significant difference between the spark source atomic emission spectrometry and the ICP-AES.
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