ISO 2899:1974
Sulphuric acid and oleums for industrial use; Determination of ammoniacal nitrogen content; Spectrophotometric method
- Standard No.
- ISO 2899:1974
- Release Date
- 1974
- Published By
- International Organization for Standardization (ISO)
- Status
- 2002-05
- Latest
- ISO 2899:1974
- Scope
- Applicable to products having contents of more than 0.0001 % (m/m). The procedure described is suitable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). It bases on distillation, with entrainment by steam, of the ammonia in the presence of an excess of sodium hydroxide and collection of the distillate in an excess of acid solution. Neutralization of the dexcess of acid and formation of the coloured complex by treatment with sodium phenate and sodium hypochlorite in the presence of acetone. Spectrophotometric measurement of the indophenol obtained at a wavelength of about 630 nm. Has also been approved by the IUPAC.
ISO 2899:1974 history
- 1974 ISO 2899:1974 Sulphuric acid and oleums for industrial use; Determination of ammoniacal nitrogen content; Spectrophotometric method
