Photometric determination of niobium with azo-dyestuffs
The azo-dyestuffs, which contain the analytically functional O,O'-dioxyazo group and are widely employed as photometric reagents for niobium, are reviewed. Two new groups of reagents are described : mono-azo-dyestuns based on R-salt and 2,7-bisazo dyestuffs based on chromotropic acid. The react...
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| Published in | Talanta (Oxford) Vol. 13; no. 5; p. 689 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Netherlands
01.05.1966
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| Online Access | Get more information |
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| Summary: | The azo-dyestuffs, which contain the analytically functional O,O'-dioxyazo group and are widely employed as photometric reagents for niobium, are reviewed. Two new groups of reagents are described : mono-azo-dyestuns based on R-salt and 2,7-bisazo dyestuffs based on chromotropic acid. The reaction with niobium is sensitive (epsilon = 20,000 to 40,000), selective and takes place in strongly acidic solution (0.5-6M hydrochloric or nitric acid). It is possible to extract with butanol the diphenylguanidine salt of the corresponding niobium complex and to measure the absorbance of the extract. |
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| ISSN: | 0039-9140 |
| DOI: | 10.1016/0039-9140(66)80003-6 |