Abstract：After the calibration curve was prepared using 11 certified reference materials of nickel-based alloy with similar content to invar alloy, a method for simultaneous determination of fourteen elements (C, Si, Mn, P, S, Ni, Cr, Mo, Cu, Al, Nb, Ti, Co and Fe) in invar alloy was established by glow discharge optical emission spectrometry without sample treatment. The optimal conditions of glow discharge spectrometer for the determination of invar alloy were obtained as follows: the module voltage and phase voltage was 8.22 V and 3.82 V, respectively; the power was 70 W; the flushing time was 80 s; the integral time was 60 s. The calibration curves were plotted with mass fraction of each element as horizontal ordinate and its corresponding spectral intensity as vertical coordinate. The correlation coefficients of calibration curves were all higher than 0.99. The actual sample of invar alloy was analyzed by the experimental method. The results showed that the mass fraction of Cr,Ni, Mo, Ti, and Fe were all higher than 0.3% with relative standard deviations (RSD, n=11) all not higher than 1%, the mass fraction of C, Si, Mn, P, S, Cu, Al,Nb and Co were all less than 0.3% with relative standard deviations (RSD, n=11) all less than 5%.The proposed method was applied to the determination of fourteen elements in invar alloy samples. The results were basically consistent with those obtained by titration method (Ni and Fe), high frequency combustion-infrared absorption method (C and S) or inductively coupled plasma atomic emission spectrometry (Si, Mn, P, Cr, Mo, Cu, Al,Nb,Ti and Co).
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