ISO 1981:1977
Nitric acid for industrial use; Determination of nitrous compounds; Titrimetric method
- Standard No.
- ISO 1981:1977
- Release Date
- 1977
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 1981:1977
- Scope
- 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.
ISO 1981:1977 history
- 1977 ISO 1981:1977 Nitric acid for industrial use; Determination of nitrous compounds; Titrimetric method
