The U.S.G.S. phosphate-fluoride-iodate method for the determination of very small amounts of thorium in naturally occurring materials
By: F.S. Crimaldi and J.G. Fairchild
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Abstract
Detailed procedures are presented for the determination of very small percentages of thorium. The methods are designed to determine 0.001% of thorium oxide as the lower limit and are applicable to nearly all types of rocks. For quantities below a milligram of ThO2, the thorium is determined nephelometrically as the iodate or photemetrically with p-dimethylamineasephenylarsonic acid. For quantities of thorium above one milligram of ThO2, the thorium is determined gravimetrically. A discussion of the important feature of the methods and a summary of the more important experimental work that lead to the adoption of the procedures.
Suggested Citation
Crimaldi, F., Fairchild, J., 1949, The U.S.G.S. phosphate-fluoride-iodate method for the determination of very small amounts of thorium in naturally occurring materials, 24 p., https://doi.org/10.3133/70094925.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Unnumbered Series |
| Title | The U.S.G.S. phosphate-fluoride-iodate method for the determination of very small amounts of thorium in naturally occurring materials |
| DOI | 10.3133/70094925 |
| Year Published | 1949 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Washington, DC |
| Description | 24 p. |
| Additional Online Files (Y/N) | N |