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IS0
O RG A N I ZAT I O N FO R STA N DARD I Z AT I ON
I N T E RN AT I O NA L
IS0 RECOMMENDATION
R 318
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF ALUMINIUM OXIDE
1st EDITION
July 1963
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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 $herefore 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 318, Methods of Chemical Analysis of Manganese Ores-
Determination of Aluminium Oxide, was drawn up by Technical Committee ISO/TC 65,
Manganese Ores, the Secretariat of which is held by the Komitet Standartov, Mer i Izme-
ritel’nyh Priborov pri Sovete Ministrov SSSR.
Work on this question by the Technical Committee began in 1954 and led, in 1957,
to the adoption of a Draft IS0 Recommendation.
In October 1958, this Draft IS0 Recommendation (No. 251) was circulated to all the
IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Austria Hungary Portugal
Bulgaria India Republic of
Burma Ireland South Africa
Chile Italy Romania
Czechoslovakia Japan Spain
France Netherlands United Kingdom
Germany Poland
U.S.S.R.
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 July 1963, to accept it as an IS0 RECOMMENDATION.
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ISO/ R 318 - 1983 (E)
IS0 Recommendation R 318 July 1963
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF ALUMINIUM OXIDE
(Atomic mass Ai: 26.98; molecular mass A1,03 : 101.96)
This IS0 Recommendation contains two parts:
I. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . section 1,
II. Oxyquinoline method of aluminium oxide determination with its pre-
liminary isolation in the form of phosphate . . . . . . . . . . . sections 2 to 5.
I. INTRODUCTION
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 0.10 mm and checked on a sieve of appro-
priate size.
Simultaneously with the collection of samples for the determination of aluminium oxide,
take three more test samples for the determination of hygroscopic moisture.
i
Calculate the content of aluminium oxide in ore which is absolutely dry by multiplying the
numerical results of the determination of aluminium oxide by the conversion factor K, as
found from the following formula:
1 O0
K=-
100- A
where
A = hygroscopic moisture content, per cent.
1.2 The determination of aluminium oxide in manganese ore is carried out by simultaneously
analysing 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 aluminium oxide content.
The arithmetical mean of the three results is accepted as the final result.
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[SO/ R 318 - 1!%3 (E)
The following conditions should be observed:
The maximum difference between the highest and the lowest results should not exceed
double the absolute value of the permissible tolerance on the result of the analysis (for the
corresponding interval of aluminium oxide content), shown in the table under clause 5.2,
" Accuracy of method ".
The average result of the simultaneous check analysis of the standard sample of manganese
ore for aluminium oxide content should not differ from the result shown in the certificate
by more than the it value of the permissible tolerance (for the corresponding interval of
aluminium oxide content), shown in the table under clause 5.2, " 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 the residues should be weighed to an accuracy of k0.0002 g.
1.4 Distilled water should be used during the procedure and for the preparation of solutions.
1.5 Meanings of the following expressions :
4
hot water (or solution) implies a temperature of the liquid of 60 to 70 OC;
warm water (or solution) implies a temperature of the liquid of 40 to 50 "C;
diluted 1 : 1, 1 : 2, 1 : 5, etc. means that
the first figure gives the number of parts by volume of
concentrated acid or some other solution, and
the second figure gives the number of parts by volume
of water.
1.6 Indications as to the concentration of solutions show the quantity of solute (in grammes)
in the corresponding volume of the solvent.
The following symbols and abbreviations are used :
cm centimetre
d relative density
g gramme
g/l grammes per litre
ml millilitre
mm millimetre
PFA pure for analysis
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iSO/ R 318 - 1963 (E)
II. OXYQUINOLINE METHOD OF ALUMINIUM OXIDE DETERMINATION
WITH ITS PRELIMINARY ISOLATION IN THE FORM OF PHOSPHATE
2. PRINCIPLE OF METHOD
After the separation of silicic acid by dehydration, the aluminium is separated from most
accompanying elements as aluminium phosphate in the presence of sodium thiosulphate.
The determination is completed by the precipitation of aluminium with oxyquinoline and its
subsequent weighing as aluminium oxide.
3. REAGENTS REQ
...