ISO 1981:1977
Withdrawn
Nitric acid for industrial use — Determination of nitrous compounds — Titrimetric method
Hardcopy , PDF
English, French
11-01-1977
05-10-2019
Two cases are considered: content of nitrous compounds, expressed as HNO2, equal to or greater than 0,01 % (m/m) and content of nitrous compounds, expressed as HNO2, less than 0,01 % (m/m). The principle consists in oxidatiuon of the compounds present in a test portion by an excess of standard volumetric potassium permanganate solution. Addition of an excess of a standard volumetric iron(II) sulphate solution, and titration of this excess with a standard volumetric potassium permanganate solution. Replaces ISO Recommendation R 1981-1971.
| Committee |
ISO/TC 47
|
| DocumentType |
Standard
|
| Pages |
3
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NBN T 03 037 : 1979 | Identical |
| BS 5688-5:1979 | Identical |
| BS 4367:1968 | Similar to |
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