Spectrophotometric catalytic determination of small amounts of rhenium in mineralized rocks and molybdenite
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Abstract
Rhenium is determined by spectrophotometry of the tellurium sol formed by the reduction of tellurate by stannous chloride under the catalytic influence of rhenium. A detailed investigation of the conditions for high sensitivity and stability at lowest concentration levels of rhenium is presented as well as the behavior of twenty-six ions. The method is applied to the determination of some tenths of a part per million or more of rhenium in a milligram aliquot of mineralized rocks, mixtures of molybdenite and rocks, and molybdenite concentrates. The practical quantity limit of detection is 2 x 10-10 gram of rhenium. Samples are decomposed with a mixture of calcium oxide, calcium chloride, and magnesium oxide. On leaching, the constituents of the sample are precipitated either as calcium salts or as hydroxides except for rhenium and a small amount of molybdenum which pass into the filtrate. Residual molybdenum is removed extraction with 8-quinolinol in chloroform. Better than ninety-five percent recoveries are obtained with two fusions with flux.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Spectrophotometric catalytic determination of small amounts of rhenium in mineralized rocks and molybdenite |
| Series title | Open-File Report |
| Series number | 62-126 |
| DOI | 10.3133/ofr62126 |
| Year Published | 1962 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | 50 p. |