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Ref. No.: iSO/ R 549- 1966 (E)
I NT ERN AT I ON AL
O RG A N IZAT I O N FOR STAND AR D I Z AT I O N
IS0 RECOMMENDATION
c
R 549
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF COMBINED WATER CONTENT
1st EDITION
December 1966
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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 549, Methods of Chemical Analysis of Manganese Ores-
Determination of Combined Water Content, was drawn up by Technical Committee ISO/TC 65,
Manganese Ores, the Secretariat of which is held by the Komitet Standartov, Mer i Izmeritel’
nyh Priborov pri Sovete Ministrov SSSR (GOST).
Work on this question by the Technical Committee began in 1957 and led, in 1959,
to the adoption of a Draft IS0 Recommendation.
In November 1962, this Draft IS0 Recommendation (No. 538) 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 :
Australia Hungary Romania
Austria India Spain
Burma Iran U.A.R.
Chile Ireland United Kingdom
Czechoslovakia Italy U.S.S.R.
France Japan Yugoslavia
Germany Poland
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 1966, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 549 - 1966 (E)
IS0 Recommendation R 549 Decem ber 1966
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF COMBINED WATER CONTENT
(Molecular mass 18.02)
1. GENERAL INSTRUCTIONS
1.1 In the following analysis, use a sample for chemical analysis of air-dried manganese ore,
which has been crushed to a size not exceeding O. 10 mm and checked on a sieve of appropriate
size.
Simultaneously with the collection of samples for the determination of combined water,
take three more test samples for the determination of hygroscopic moisture.
Calculate the results of the determination of combined water content in ore which is abso-
lutely dry by multiplying the numerical results of the determination of combined water by
the conversion factor Ky as found from the following formula:
1 O0
K=
100 - A
where A = hygroscopic moisture content, per cent.
1.2 The determination of combined water in manganese ore is carried out by analysing simul-
taneously three samples of ore with two blank determinations to enable a corresponding
correction in the result of the determination to be made.
Simultaneously, and under the same conditions, carry out a check analysis of a standard
sample of manganese ore for combined water content.
The arithmetical mean of the three results is accepted as the final result.
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iSO/ R 549 - 1966 (E)
The following conditions should be observed :
The maximum difference between the highest and the lowest results of the determination of
combined water content in the ore analysed should not exceed double the absolute value
of the permissible tolerance on the result of the analysis (for the corresponding interval of
combined water content), shown in the table under clause 6.2, " Accuracy of method ".
The average result of the simultaneous check analysis of the standard sample of manganese
ore for combined water content should not differ from the result shown in the certificate by
more than the i value of the permissible tolerance (for the corresponding interval of com-
bined water content), shown in the table under clause 6.2, " Accuracy of method ".
For the analysis take a standard sample of the type of ore to which the sample being analysed
belongs.
1.3 The test samples and absorption tubes should be weighed to an accuracy of & 0.0002 g.
1.4 The following symbols and abbreviations are used:
d relative density
g gramme
mm millimetre
PFA pure for analysis
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IS0 / R 549 - 1966 (E)
2. PRINCIPLE OF METHOD
The combined water is separated by heating ore in a jet of dry air and is collected into absorption
tubes, filled with magnesium perchlorate.
3. REAGENTS REQUIRED
3.1 Magnesium perchlorate (Mg(ClOJ3, PFA.
3.2 Lead oxide (PbO), PFA.
3.3 Lead dioxide (PbOJ, PFA.
3.4 Hydrochloric acid, PFA, diluted (1 : 1).
3.5 Sulphuric acid, PFA (d 1.84).
4. APPARATUS AND PREPARATION OF APPARATUS
4.1 Silver spiral.
4.2 The apparatus for the determination of combined water content (see diagram
...