| Agent Name |
Praseodymium |
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| CAS Number |
7440-10-0 |
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| Formula |
Pr |
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| Major Category |
Metals |
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| Category |
Rare Earth Metals |
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| Description |
Yellowish metal; oxides form on exposure to moist air; [Merck Index] It is soft, silvery, and malleable. It develops a green oxide coating when exposed to air. [Reference #1] |
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| Sources/Uses |
Source: Rare earth minerals; [Merck Index] Uses: Praseodymium salts are used in mischmetal, cores for carbon arcs, colorants (glazes and glasses), catalysts, phosphors, and lasers; [Hawley] Didymium glass, used in welders goggles, contains Pr. [Reference #1] |
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| Comments |
First prepared in pure form in 1931; Recent improvement in technology (ion-exchange and solvent extraction techniques) allow less costly isolation of Pr and other rare earth metals. [Reference #1] See "RARE EARTH METALS." |
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| Reference Link |
http://periodic.lanl.gov/elements/59.html |
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| Exposure Assessment |
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| Explanatory Notes |
mp = 935 deg C; [Merck Index] |
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| Links to Other NLM Databases |
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