ISO 622:1981
Solid mineral fuels; Determination of phorphorus content; Reduced molybdophosphate photometric method
- Standard No.
- ISO 622:1981
- Release Date
- 1981
- Published By
- International Organization for Standardization (ISO)
- Status
- Replace By
- ISO 622:2016
- Latest
- ISO 622:2016
- Scope
- For taking the phosphorus into solution the following two methods are specified: The carbonaceous material is removed by ashing in amuffle furnace under specified conditions and the phosphorus is extracted by treatment with hydrofluoric and sulphuric acids. The carbonaceous material is removed by repeated oxidation with nitric acid in the presence of sulphuric acid. The determination is carried out by adding ammonium molybdate and ascorbic acid solution and measuring the absorbance of the resulting blue solution by a siutable optical instrument.
ISO 622:1981 history
- 2016 ISO 622:2016 Solid mineral fuels - Determination of phosphorus content - Reduced molybdophosphate photometric method
- 1981 ISO 622:1981 Solid mineral fuels; Determination of phorphorus content; Reduced molybdophosphate photometric method
