偏最小二乘分光光度法同时测定钢铁中铬和锰的研究

Study of simultaneous determination of chromium and manganese by partial least square spectrophotometry

在酸性介质中，以AgNO3作催化剂，（NH4）2S2O8作氧化剂，将溶液中的Cr（Ⅲ）和Mn^2＋氧化成Cr2O7^2-和MnO4^-。Cr2O7^2-和MnO4^-的质量浓度分别在20-80μg/mL和4-14μg/mL范围内遵守比耳定律，并且二者的吸光度具有很好的加和性。据此，提出了不经分离，直接用偏最小二乘分光光度法测定铬和锰。方法用于PCrNi3Mo，GCr15和86CrMoV7三种钢铁样品中铬和锰的测定，测定结果与用国家标准方法测定的结果相符。

In acid medium and in the presence of AgNO3 as catalytic agent and （NH4）2SO4 as oxidic agent, Cr（Ⅲ）and Mn^2＋ in solution are oxidized into Cr2O7^2- and MnO4^-. Beers law is obeyed in the mass concentration range of 20-80μg/mL for Cr2O7^2- and 4-14 μg/mL for MnO4^- and their absorbency have additivity. According to the above, A partial least square spectrophotometric method, by that chromium and manganese were determined simultaneously without separation was proposed. As compared with P-Matrix and PLS, this method is more accurate. It is employed in the determination of chromium and manganese in three steels（ PCrNi3Mo,GCr15 and 86CrMoV7） and the results are in consistent with those obtained by nationnal standard methods.