| 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. |
| Genre: | Article |
| ProdID: | 70011089 |
| Citation Author: | Waring, C. L.; Mela, Jr. , H. |
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| Citation End Page: | 435 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Analytical Chemistry |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Method for determination of small amounts of rare earths and thorium in phosphate rocks; 1953; Article; Journal; Analytical Chemistry; Waring, C. L.; Mela, Jr. , H. |
| Citation Start Page: | 432 |
| Citation Volume: | 25 |
| Citation Year: | 1953 |
| Type: | citation/reference |
| Text: | Method for determination of small amounts of rare earths and thorium in phosphate rocks; 1953; Article; Journal; Analytical Chemistry; Waring, C. L.; Mela, Jr. , H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1953 00:00 -0600 |
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