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IS0
I NTERN AT I ON A L OR GAN IZATl O N FOR STA N DARD IZATl ON
IS0 RECOMMENDATION
SODIUM CARBONATE FOR INDUSTRIAL USE
EXPRESSION OF TEST RESULTS
1 st EDITION
May 1968
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The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRlEF HISTORY
Expression of test
The IS0 Recommendation R 747, Sodium carbonate for itzdirstrial us('
results, was drawn up by Technical Committee iSO/TC 47. Chernistol. tlie Secretariat of which is
held by the Ente Nazionale Italian0 di Unificazione (UNI).
Work on this question by the Technical Committee hegaii it3 1051 and led. in 1956, to the
adoption cif a Draft IS0 Recommendation.
In June 19hb. this Draft IS0 Recommendation (No 1013) W~F ~iriul'ited to all the IS0 Member
Bodies for enquiry It was approved. subject to a few modificdtions of an editoridi nature, by the
following Member Bodies
Argentina Italy Swit Lerland
Austria Japan Turkey
Belgium Korea, Rep. of I1.A.R.
Brazil Net herlands United Kingdom
Chile New Zealand I1.S.A.
Cmchoslovakia Poland I1.S.S R.
France Portugal Y usoslavia
Germany Romania
Hungary South Africa,
India Rep. of
Israel Spain
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the is0 Council,
which decided, in May 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 747-1968 (E
IS0 Recommendation R 747 May 1968
SODIUM CARBONATE FOR INDUSTRIAL USE
EXPRESSION OF TEST RESULTS
1. SCOPE
This IS0 Recommendation describes the different ways of exprcssiiig the test results for sodium
carbonate for industrial use.
2. EXPRESSION OF RESULTS
Two ways of expressing results are commonly used at present :
as a percentage by mass of the product as received, (see clause 2.1)%
(a)
as a percentage by mass of the non-volatile matter at a temperature of 250 OC.
(b)
(see clause 2.2).
2.1 As a percentage by mass of the product as received
2.1.1 Total soluble alkalinity (expressed as sodium carbonate).
(See IS0 Recommendation R 740, Sodium carbonate for industrid use ~ Determination of
total soluble alkalinity - Volumetric method, section 7).
2.1.2 Sodium hydrogen carbonate.
(See IS0 Recommendation R 741, Sodium hydrogen carbonate for industrial use -
Determinati
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