Standard

ISO 937:1978

Dec 1978 Withdrawn

Note: This standard has a new edition: ISO 937:2023

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Abstract

The method consists in digesting of a test portion with concentrated sulphuric acid, using copper(II) sulphate as a catalyst, to convert organic nitrogen to ammonia ions. Then alkalisation, distillation of the liberated ammonia into an excess of boric acid solution, titration with hydrochloric acid to determine the ammonia bound by the boric acid, and calculation of nitrogen content of the sample from the amount of ammonia produced.

Document information

Standard from ISO
Published: 1 December 1978
Withdrawn: 28 August 2023
Edition: 1
Version: 1
Document type: IS
ISBN:

ICS 67.120.10
ISO TC ISO/TC 34/SC 6

Product Relations

Revised by: ISO 937:2023
Revised by: ISO 937:2023
Revised by: ISO 937:2023
Referred by: SN-CWA 16814:2014

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Withdrawn

ISO 937:1978
Revised by

Historical draft

ISO 937:2023

Historical draft

ISO 937:2023

Published

ISO 937:2023

ISO 937:1978

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ISO 937:2023

ISO 937:2023

ISO 937:2023

ISO 937:1978

Abstract

Document information

Product Relations

Product life cycle

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Extended editions Extended editions (0)

Version history Related corrigendum and amendments (0)

Version history History (4)

ISO 937:2023

ISO 937:2023

ISO 937:2023

ISO 937:1978

Abstract

Document information

Product Relations

Product life cycle