应用光电直读光谱法测定了不锈钢(CD4MCu)中碳、镍、铬、铜及钼5种元素。通过下述三项措施提高了方法的准确度和精密度:共存元素的干扰校正;增加制作各元素的标准工作曲线时所用的标准样品数,用了两套标准共13块光谱分析用标准样品;选择样块上合适部位作为光谱激发点。上述5种元素的测量范围(质量分数)依次为0.02%~0.35%,3.50%~28.0%,6.50%~32.0%,0.05%~5.0%及0.05%~4.0%。对方法的精密度做了试验,测得相对标准偏差(n=11)为碳4.8%,镍、铬、钼0.4%,铜2.3%。应用此方法分析了5个不锈钢(CD4MCu)样品,所测得数据与用GB标准中化学法所测得的结果完全一致。

Five elements (i.e., C, Ni, Cr, Cu and Mo) in stainless steel (CD4MCu) were determined by photoelectric direct-reading atomic emission spectrometry. Accuracy and precision of the method were improved by correction of interferences of co-existing elements, increasing number of standard samples used in preparation of standard working curves for the 5 elements (13 standard samples were taken in this method), and selecting proper sites on the sample cubes for excitation. Ranges of determination (w%) for the 5 elements were as follows: carbon: 0.02%-0.35%; nickel: 3.50%-28.0%; chromium: 6.50%-32.0%; copper: 0.05%-5.0%; molybdenum: 0.05%-4.0%. Precision was tested and values of RSD′s (n=11) found were 4.8% (for C), 0.4% (for Ni, Cr and Mo) and 2.3% (for Cu). Five samples of stainless steel (CD4MCu) were analyzed by the present method, giving results in consistency with those obtained by the chemical method given in GB standards.