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UDC 661.419 : 543.21 Ref. No. : ISO/R 907-1968 (E)
IS0
I NT ERN AT I ON A L O RG A N I ZATl O N FOR S TA N DA RD IZATlO N
IS0 RECOMMENDATION
ir,
R 907
HYDROCHLORIC ACID FOR INDUSTRIAL USE
DETERMINATION OF SULPHATED ASH
G RAV I M ET R IC M ETH OD
1st EDITION
December 1968
COPYRIGHT RESERVED
of IS0 Recommendations and IS0 Standards
The copyright
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 907, Hydrochloric acidfor industrial use - Determination of sulphated ash -
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. 1177) 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 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 Investigacion y Tecnologia Industrial (Costa Rica, Guatemala, Honduras, Nicaragua, El Savador,
Panama).
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ISO/R 907-1968 (E)
IS0 Recommendation R 907 December 1968
HYDROCHLORIC ACID FOR INDUSTRIAL USE
DETERMINATION OF SULPHATED ASH
G R AV IM ET R I C METHOD
1. SCOPE
This IS0 Recommendation describes a gravimetric method for the determination of sulphated ash of hydrochloric
acid for industrial use.
2. PRiNClPLE
Evaporation of a test portion; conversion to sulphates by treatment with sulphuric acid; ignition at 800 "C and
weighing.
3. REAGENT
(m/m) or 36 N solution.
Sulphuric acid, approximately d = 1.84, 96
4. APPAKATUS
Ordinary laboratory apparatus and
4.1 Platinum dish, flat-bottomed, capacity approximately 200 ml.
4.2 Electric furnace, regulated at 800 k 50 "C.
5. PROCEDURE
5.1 Test portion
In the platinum dish (4.1), previously ignited at 800 OC, cooled in a desiccator and weighed, weigh, to
the nearest 10 mg, approximately 100 g of the test sample.
5.2 Determination
Evaporate most of the acid (the final volume should amount to about 5 to 10 mi) by carefully heating
the dish containing the test portion (on a sand bath, for example). Then allow to cool to room temperature.
Take up by means of 1 ml of the sulphuric acid solution (3) and heat to dryness.
Place the dish containing the residue in the electric furnace (4.2), heated at 800 * 50 OC, and keep at
this temperature for about 15 minutes.
Remove the dish from the furnace, place into a desiccator and, after cooling, weigh.
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ISO/R 907-1968 (E)
6. EXPRESSION OF RESULTS
Sulphated ash is given as a percentage, by mass, by the following formula :
R X 100
E
where
R is the mass, in grammes, of the residue weighed;
E is the mass, in grammes, of the test portion.
7. TEST REPORT
Give the following particulars :
the reference of the method used;
(U)
the results and the method of expression used;
(b)
any unusual features noted during the determination;
(c)
any operation not included in this IS0 Recommendation or regarded as optional.
(d)
1
Price based on 2 pages
Date of the first printing :
June 1969 -4-
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CDU 661.419 : 543.21 Réf. No : ISO/R 907-1968 (F)
IS0
O RG A N I SAT1 O N I N T ER N AT1 O N A LE D E N O RM A LI SAT1 ON
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