ISO 2198:1972
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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05-09-2019
English, French
08-01-1972
Applicable to products having content greater than 0,02 % (m/m). The principle consists in dissolution, in a specified volume of sodium chloride solution saturated at 20 C, of the total sodium carbonate present in the test portion. Filtration of the insoluble matter which constitutes the major part of the sodium hydrogen carbonate. Titration, in an aliquot part of the filtrate, of the total alkalinity (corresponds to the Na2CO3 and to the more or less constant soluble part of the NaHCO3).Determination of the carbonate content by reading of the attached graph, which gives a direct reading of the difference betwwen the total alkalinity and that part due to the sodium hydrogen carbonate.
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