ISO 622:1981

Name: ISO 622:1981
Brand: ISO
SKU: ISO 622:1981
Price: 81.07 EUR
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Solid mineral fuels — Determination of phorphorus content — Reduced molybdophosphate photometric method

Publication date: Aug 1, 1981

95.99 Withdrawal of Standard Nov 18, 2016

General information

Current stage: 95.99 Withdrawal of Standard Nov 18, 2016

Originator: ISO

Owner: ISO/TC 27/SC 5 Methods of analysis

Type: International Standard

ICS: 75.160.10 Solid fuels

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Status: Withdrawn

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Languages: French English

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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WITHDRAWN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WITHDRAWN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

WITHDRAWN
ISO 622:2016