ISO 622:1981 PDF
Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method
Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method
- Статус документа:
- Отменён
- Формат:
- Электронный (PDF)
- Количество страниц:
- 4
- Дата публикации:
- 1 августа 1981 г.
- Издание:
- ISO IS 622 edition 1 version 1
- ICS:
- 75.160.10
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.
Технические детали
- Технический комитет
- ISO/TC 27/SC 5 - Methods of analysis
- SKU
- ISO 622:1981