ISO 2515:1973
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Ammonium hydrogen carbonate for industrial use (including foodstuffs) Determination of ammoniacal nitrogen content Volumetric method after distillation
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05-22-2019
English, French
04-01-1973
Specifies a titrimetric method consisting in distillation of the ammonia after displacement by an alkaline solution; absorption in an excess of standard volumetric sulphuric acid solution and back-titration with standard volumetric sodium hydroxide solution in the presence of an indicator. The absorption of the ammonia may also be carried out in an excess of boric acid solution. The titration, in this case, is carried out directly with a standard volumetric sulphuric acid solution.
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