ISO 9388:1992
Current
The latest, up-to-date edition.
Nickel alloys Determination of phosphorus content Molybdenum blue molecular absorption spectrometric method
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English, French
27-08-1992
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Phosphorus content can be determined in the range of 0,001 % (m/m) to 0,025 % (m/m). Cr(III) and silica cause interference which is eliminated. The principle is dissolution of a test portion in a mixture of nitric and hydrochloric acids, fuming with sulfuric acid, oxidation of Cr(III) to Cr(VI), precipitation of Fe(III) phosphate and redissolution of the precipitate, addition of boric, tartaric and sulfamic acids, formation and extraction of molybdophosphoric acid, reduction of the heteropoly acid to molybdenum blue and back-extraction into an aqueous phase, measurement of the absorbance of the aqueous solution at 700 nm.
| DevelopmentNote |
Also numbered as BS 6783-12(1992) (04/2005)
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| DocumentType |
Standard
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| Pages |
6
|
| PublisherName |
International Organization for Standardization
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| Status |
Current
|
| ISO 9725:2017 | Nickel and nickel alloy forgings |
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| ISO 5725:1986 | Precision of test methods Determination of repeatability and reproducibility for a standard test method by inter-laboratory tests |
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