ISO 622:1981 Historical

719177

Solid mineral fuels - Determination of phorphorus content - Reduced molybdophosphate photometric method

standard by International Organization for Standardization , 08/01/1981

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Full Description

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.

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Document History

  1. ISO 622:2025


    Coal and coke - Determination of phosphorus - Reduced molybdophosphate photometric method

    • Most Recent

  2. ISO 622:2016


    Solid mineral fuels - Determination of phosphorus content - Reduced molybdophosphate photometric method

    • Historical Version

  3. ISO 622:1981

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    Solid mineral fuels - Determination of phorphorus content - Reduced molybdophosphate photometric method

    • Historical Version

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Product Details

Published:

08/01/1981

Number of Pages:

4

File Size:

1 file

Note:

This product is restricted and cannot be purchased in the following countries Ukraine, Russia, Belarus