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UDC 669.74
IS0
I N T ER N AT I O N A L ORGAN I2 AT I ON FOR STAND AR D I Z AT I O N
IS0 R ECOM MEN DATI ON
R 316
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF COBALT
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 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 316, Methods of Chemical Analysis of Manganese Ores-
Determination of Cobalt, 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.
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. 249) 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 316 - 1983 (E)
IS0 Recommendation R 316 July 1963
METHODS OF CHEMICAL ANALYSIS OF MANGANESE ORES
DETERMINATION OF COBALT
(Atomic mass Co: 58.94; molecular mass COO: 74.94)
This IS0 Recommendation contains two parts :
I. Introduction. . section 1,
II. Colorimetric method of determination of cobalt in the form of a complex
with nitroso-R-salt . 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 O. 10 mm and checked on a sieve of appropriate
size.
Simultaneously with the collection of samples for the determination of cobalt, take three
more test samples for the determination of hydroscopic moisture.
Calculate the content of cobalt in ore which is absolutely dry by multiplying the numerical
results of the determination of cobalt by the conversion factor K, as found from the follow-
ing formula :
100
K= ~
100-A
where A = hygroscopic moisture content, per cent.
1.2 The determination of cobalt 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 cobalt content.
The arithmetical mean of the three results is accepted as the final result.
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iSO/ R 316 - 1963 (E)
The foilowing 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 correspond-
ing interval of cobalt 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 cobalt content should not differ from the result shown in the certificate by more
than the f value of the permissible tolerance (for the corresponding interval of cobalt
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 f 0.0002 g.
1.4 Distilled water should be used during the procedure and for the preparation of solutions.
1.5 Meanings of the following expressions :
hot water (or solution) implies a temperature of the liquid of 60 to 7OOC;
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 1
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.
1.7 The following symbols and ab
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