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IS0
I N T E RN AT I O N A L O R G A N IZ AT 1 O N FOR STAND AR D 1 ZATl O N
IS0 RECOMMENDATION
R 851
SODIUM TRIPOLYPHOSPHATE FOR INDUSTRIAL USE
Measurement of pH
Po tent io metric met hod
1st EDITION
October 1968
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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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BRIEF HISTORY
The IS0 Recommendation R 85 1, Sodium tripolyphosphate for industrial use - Measurement
of pH - Potentiometric method, was drawn up by Technical Committee ISO/TC 47, Chemistry, the
Secretariat of which is held by the Ente Nazionale Itaiiano di Unificazione (UNI).
Work on this question by the Technical Committee began in 1960 and led, in 1966, to the
adoption of a Draft IS0 Recommendation.
In December 1966, this Draft IS0 Recommendation (No. 11 13) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Austria
Israel Spain
Belgium Italy Switzerland
Brazil Japan Thailand
Bulgaria
Korea, Dem. P.R. of Turkey
Chile
Korea, Rep. of U.A.R.
Czechoslovakia Netherlands
United Kingdom
France New Zealand
U.S.S.R.
Germany
Poland Yugoslavia
Hungary
Romania
India South Africa, Rep. of
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 October 1968, to accept it as an IS0 RECOMMENDATION.
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ISO/R 851-1968 (E
IS0 Recommendation R 851 Octo ber 1968
SODIUM TRIPOLYPHOSPHATE FOR INDUSTRIAL USE
Measurement of pH
Potentiometric method
1. SCOPE
This IS0 Recommendation describes a potentiometric method for the measurement of the pH value
of a solution at a conventional concentration of 10 g/l, of sodium tripolyphosphate for industrial
use.
2. PRINCIPLE
Measurement of the pH of a sodium tripolyphosphate solution at a conventional concentration of
10 g/1 by means of a pH meter fitted with a glass electrode.
3. REAGENTS
Freshly boiled and cooled d
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