Spectrophotometric determination of niobium in rocks
Journal of Research of the U.S. Geological Survey
By: L. Paul Greenland and E. Y. Campbell
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Abstract
After acid decomposition and evaporation to volatilize silica, samples containing 0.5 6 μg Nb are fused with pyrosulfate and dissolved in hydrochloric acid tartaric acid. Niobium is separated by thiocyanate extraction with amyl alcohol and back-extracting from the organic solvent with dilute hydrofluoric acid. Niobium is reacted with 4-(2-pyridylazo)-resorcinol to obtain a colored species. Analytical error, estimated from replicate analyses of eight U.S. Geological Survey standard rocks, ranges from 2.9 to 6.4 percent at the 1 27 μg/g Nb level.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Spectrophotometric determination of niobium in rocks |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 2 |
| Issue | 3 |
| Year Published | 1974 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 3 p. |
| First page | 353 |
| Last page | 355 |
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