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ISO 622:1981

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

Aug 1, 1981
95.99 Withdrawal of Standard   Nov 18, 2016

General information

95.99     Nov 18, 2016

ISO

ISO/TC 27/SC 5

International Standard

75.160.10  

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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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 926:1969

NOW

WITHDRAWN
ISO 622:1981
95.99 Withdrawal of Standard
Nov 18, 2016

REVISED BY

PUBLISHED
ISO 622:2016