Determination of tungsten in geologic materials by neutron activation analysis
Journal of Research of the U.S. Geological Survey
By: Frederick Otto Simon and Carl L. Rollinson
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Abstract
A method is described for the determination of tungsten in geologic materials. After fusion with sodium peroxide, tungsten is isolated by extraction into chloroform with a-benzoinoxime, back extraction into aqueous potassium hydroxide, and precipitation with a-benzoinoxime. The activities of the 0.13 and 0.48 MeV gamma rays are measured. The activity of the 0.155 MeV gamma ray of 188Re (188W), added prior to the fusion, is measured to determine the yield; yields normally range from 40 to 90 percent. The coefficients of variation for less than part-per-million concentrations of tungsten are normally <20 percent; the limit of detection is 0.005 ppm for a 100-mg sample.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Determination of tungsten in geologic materials by neutron activation analysis |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 3 |
| Issue | 4 |
| Year Published | 1975 |
| Language | English |
| Publisher | U. S. Geological Survey |
| Description | 4 p. |
| First page | 475 |
| Last page | 478 |
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