2011•Metallurgical AnalysisRequires access
Study on the interference of molybdenum in the determination of niobium by sulphochlorophenol S photometric method
Xiao Hu
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Abstract
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.