ISO 937:1978
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
View Superseded by
Meat and meat products — Determination of nitrogen content (Reference method)
Hardcopy , PDF
English, French
01-12-1978
09-04-2025
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.
| Committee |
ISO/TC 34/SC 6
|
| DevelopmentNote |
Also numbered as BS 4401-2(1980) (08/2005)
|
| DocumentType |
Standard
|
| Pages |
3
|
| ProductNote |
THIS STANDARD ALSO REFERS ISO 3100.
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| SupersededBy |
| Standards | Relationship |
| DS ISO 937 : 1979 | Identical |
| BIS IS 5960-1 : 1996(R2001) | Identical |
| NFV 04 407 : 2002 | Identical |
| NEN ISO 937 : 1992 | Identical |
| S.R. CWA 16814:2014 | NUTRITIONALLY CORRECT LOW-COST FOOD FOR PEOPLE AT RISK OF POVERTY - GENERAL, SPECIFIC REQUIREMENTS AND LABELLING OF CHANCE FOOD |
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