ISO 1694:1976
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The latest, up-to-date edition.
Cryolite, natural and artificial Determination of iron content 1,10- Phenanthroline photometric method
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
English, French
09-01-1976
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Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.
| DocumentType |
Standard
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| Pages |
5
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| PublisherName |
International Organization for Standardization
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| Status |
Current
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| Standards | Relationship |
| BS 5050:1974 | Similar to |
| NBN T 03 434 : 1983 | Identical |
| ISO/TR 4277:2009 | Cryolite, natural and artificial Conventional test for evaluation of free fluorides content |
| PD ISO/TR 4277:2009 | Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content |
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