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IS0
FOR STAND AR0 iZATlO N
I N T ERN AT I O N A L ORGANIZATION
R 906
DROCHLORIC ACID FOR I DUSTRIAL USE
t
DETERMINATION OF SULPHATE CONTENT
BARIUM SULPHATE GRAVIMETRIC METHOD
1st EDITION
December 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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BRIEF HISTORY
The IS0 Recommendation R 906, Hydrochloric acid for industrial use - Determination of sulphate content -
Barium sulphate gravimetric method, was drawn up by Technical Committee ISOlTC 47, Chemistry, the Secretariat
of which is held by the Ente Nazionale Italian0 di Unificazione (UNI).
Based on detailed work on this question carried out by the Technical Committee, a Draft IS0 Recommendation
was adopted in 1965.
In June 1967, this Draft IS0 Recommendation (No. 1176) was circulated to all the IS0 Member Bodies. It was
approved, subject to a few modifications of an editorial nature, by the following Member Bodies :
Austria Iran South Africa, Rep. of
Belgium Ireland Spain
Bulgaria Israel Switzerland
Chile Italy Thailand
Cuba Japan Turkey
Czechoslovakia Korea, Dem. P. Rep. of U.A.R.
France Netherlands United Kingdom
Germany New Zealand U.S.S.R.
Hungary Poland Yugoslavia
ICAITI* Portugal
India Romania
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 December 1968, to accept it as an IS0 RECOMMENDATION.
*
Institut0 Centroamericano de Investigation y Tecnologfa Industrial (Costa Rica, Guatemala, Honduras, Nicaragua, El Salvador,
Panama).
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ISO/R 906 - 1968(E)
IS0 Recommendation R 906 December 1968
HYDROCHLORIC ACID FOR INDUSTRIAL USE
DETERMINATION OF SULPHATE CONTENT
BARIUM SULPHATE G RAVIMETR IC METHOD
1. SCOPE
\
This IS0 Recommendation describes a gravimetric method for the determination of sulphate content of hydro-
.-
chloric acid for industrial use.
2. FIELD OF APPLICATION
The method is applicable to the determination of sulphates in hydrochloric acid for industrial use for S042-
contents greater than 0.1 (m/mj.
3. PRINCIPLE
Precipitation of SO4 '- ions as barium sulphate in dilute hydrochloric acid medium.
Filtration of the solution, ignition of the precipitate at 600 to 800 "C and weighing.
4. REAGENTS
Distilled water or water of equivalent purity should be used in the test.
4.1 Hydrochloric acid, approximately d = 1.18, 37 (m/m) or 12 N solution, free from sulphate ions.
4.2 Sulphuric acid, approximately d = 1.84, 96 (m/m) or 36 N solution.
4.
...