Method for determination of small amounts of rare earths and thorium in phosphate rocks
Analytical Chemistry
By: C. L. Waring and H. Mela Jr.
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Abstract
In laboratory investigations, interest developed in the possible rare-earth content of phosphate samples from Florida and the northwestern United States. Because of the difficulty of making chemical determinations of traces of individual rare earths, a combined chemical-spectrographic method was investigated. After removal of iron by the extraction of the chloride with ether, the rare earths and thorium are concentrated by double oxalate precipitation, using calcium as a carrier. The rare earths are freed from calcium by an ammonium hydroxide precipitation with a fixed amount of aluminum as a carrier. The aluminum also serves as an internal standard in the final spectrographic analysis. The method will determine from 0.02 to 2 mg. of each rare earth with an error no greater than 10%. The investigation has resulted in a fairly rapid and precise procedure, involving no special spectrographic setup. The method could be applied to other types of geologic materials with the same expected accuracy.
Suggested Citation
Waring, C.L., Mela, H., 1953, Method for determination of small amounts of rare earths and thorium in phosphate rocks: Analytical Chemistry, v. 25, no. 3, p. 432-435.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Method for determination of small amounts of rare earths and thorium in phosphate rocks |
| Series title | Analytical Chemistry |
| Volume | 25 |
| Issue | 3 |
| Year Published | 1953 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Analytical Chemistry |
| First page | 432 |
| Last page | 435 |