在这里将介紹非金屬元素S、P的看譜測定法,此法适用于鑄铁18-36,15-32,21-40,其分析范圍P=0.06～0.25%;S=0.06～0.25%,現在关于測定S、P的資料很缺乏,一些資料指出光譜法測定P的灵敏度很低,也有些資料指出在生铁中0.08%的P已不能用光譜方法測出来。为了克服光譜分析上的困难,根据材料保护与热处理研究所为测定鋼铁中C、S、P而改 Here will be introduced non-metallic elements S, P to see spectrometry, this method is suitable for cast iron 18-36,15-32,21-40, the analysis range P = 0.06 ~ 0.25%; S = 0.06 ~ 0.25% However, there is a lack of data on the determination of S and P. Some data indicate that the sensitivity of P is very low by spectrometry. Some data indicate that 0.08% of P in pig iron can not be measured spectroscopically. In order to overcome the difficulties of spectral analysis, according to the Institute of Materials Protection and Heat Treatment for the determination of C, S, P in steel