The discharge behavior of middle-low alloy steel sample was analyzed hy radio frequency glow discharge optical emission spectrometry(RF-GDOES). The effect of working parameters such as analytical power, argon pressure, prehurn time and integration time on spectral intensity and stability was investigated. The optimized analytical parameters were as follows: analytical power of 50 W, argon pressure of 900 Pa, prehurn time of 90 s and integration time of 10 s. The analytical method of trace calcium in middle-low alloy steel hy radio frequency glow discharge emission spectrometry was established using iron as internal standard. The proposed method was applied to the analysis of middle-low alloy steel CRMs and actual sample. The determination results were in good agreement with the certified values or those found hy atomic emission spectrometry(AAS) method. RSD was less than 2 %. This method could meet the requirements of production and scientific research.
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