| HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM |
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| 引用本文： | Zong Ming LUO. HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM[J]. 中国化学快报, 1990, 1(3): 229-230 |
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| 作者姓名： | Zong Ming LUO |
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| 作者单位： | Department of Chemical Engineering Guangdong Institute of Technology Guangzhou 510090 |
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| 摘 要： | In pH2.0-3.0,niobium(V)forms molybdonlobic acid with sodiummolybdate.A spectrophotometric method has been developed for the deter-mination of niobium based on the formation of ion-associate compound ofmolybdoniobate with Butyl Rhodamine B in aqueous solution in the presenceof polyvinyl alcohol and 0.4-0.7 mol/L H_2SO_4.The maximum absorption ofion-associate compound exhioits at 85 nm and the molar absorptivity is7.5×1.0~5 L.mol~(-1).cm~(-1)for niobium.The new method has been applied tothe determination of microamounts niobium in silicate rock,when niobiumcontent is at the level of 8×10~(-3)%,with the relative standard deviationof about 3%.
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HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM |
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| Zong Ming LUO. HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM[J]. Chinese Chemical Letters, 1990, 1(3): 229-230 |
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| Authors: | Zong Ming LUO |
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| Affiliation: | Department of Chemical Engineering Guangdong Institute of Technology Guangzhou 510090 |
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| Abstract: | In pH2.0-3.0, niobium(V) forms molybdonlobic acid with sodium molybdate.A spectrophotometric method has been developed for the deter-mination of niobium based on the formation of ion-associate compound of molybdoniobate with Butyl Rhodamine B in aqueous solution in the presence of polyvinyl alcohol and 0.4-0.7 mol/L H2SO4.The maximum absorption of ion-associate compound exhioits at 85 nm and the molar absorptivity is 7.5×1.05 L.mol-1.cm-1for niobium.The new method has been applied to the determination of microamounts niobium in silicate rock, when niobium content is at the level of 8×10-3%, with the relative standard deviation of about 3%. |
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