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.
李海平，唐本玲，范晓芸，毕经亮，胡晓燕*. 氯磺酚S光度法测铌时钼的干扰研究[J]. 冶金分析, 2011, 31(9): 70-73.
LI Hai-ping, TANG Ben-ling, FAN Xiao-yun, BI Jing-liang, HU Xiao-yan*. Study on the interference of molybdenum in the determination of niobium by sulphochlorophenol S photometric method. , 2011, 31(9): 70-73.
Jankiewicz B, Ptaszyński B, Wieczorek M. Spectrophotometric Determination of Cadmium (II) in Soil of Allotment Gardens in ?ód? [J]. Polish Journal of Environmental Studies, 2000, 9(2): 83-86.
Zhao D S, Bian R X, Ding Y P, et al. Determination of lead and cadmium in water samples by cloud point extraction prior to flame atomic absorption spectrometry determination [J]. Journal of the Iranian Chemical Research, 2009, 2(2): 87-94.
