氯磺酚S光度法测铌时钼的干扰研究  

Study on the interference of molybdenum in the determination of niobium by sulphochlorophenol S photometric method

作　　者：李海平[1] 唐本玲[1] 范晓芸[1] 毕经亮[1] 胡晓燕[1] 

机构地区：[1]钢铁研究总院,北京100081

出　　处：《冶金分析》2011年第9期70-73,共4页Metallurgical Analysis

摘　　要：GB/T223.39-94氯磺酚S光度法测定钢铁中Nb含量时因受到Mo的干扰,仅适用于Mo含量不大于25μg/50mL的显色体系。本文研究了氯磺酚S光度法显色体系中Mo和Nb的反应,讨论了测定Nb时Mo的干扰。结果表明,当Mo含量在25～500μg/50mL范围内时,Mo含量与其对应的吸光度有良好的线性关系,且Mo的表观摩尔吸光系数(4.75×102L.mol-1.cm-1)远小于Nb的表观摩尔吸光系数(3.21×104 L.mol-1.cm-1)。采用基体匹配法消除了测定Nb时Mo的干扰,从而使氯磺酚S光度法测Nb时Mo的允许量由25μg/50mL扩大到500μg/50mL。该方法适用于测定Mo含量高而Nb含量低的钢铁类试样。Due to the interference of molybdenum,the determination of niobium in steel by sulphochlorophenol S photometric method in GB/T223.39-94 was only applicable for the coloring system containing molybdenum content no more than 25 μg/50 mL.In this study,the reaction of molybdenum and niobium in sulphochlorophenol S photometry color system was investigated,and the interference of molybdenum with the determination of niobium was discussed.The results showed that the content of molybdenum in the range of 25-500 μg/50 mL had good linearity with its absorbance.Moreover,the apparent molar absorptivity of molybdenum（4.75×102 L·mol-1·cm-1） was far less than that of niobium（3.21×104 L·mol-1·cm-1）.The interference of molybdenum with the determination of niobium was eliminated by matrix matching method.The tolerant amount of molybdenum in the determination of niobium by sulphochlorophenol S photometric method was enlarged from 25 μg/50 mL to 500 μg/50 mL.The proposed method was applicable for the determination of steel samples containing high content of molybdenum and low content of niobium.

关 键 词：氯磺酚S光度法 钼 铌 

分 类 号：O657.32[理学—分析化学]