ISO 10348:1993

INTERNATIONAL IS0
STANDARD 10348
First edition
1993-02-01
- Processing wastes -
Photography
Determination of silver content
- Dgtermina tion de la teneur
Photographie - Effluents de traitement
en argent
Reference number
IS0 10348:-I 993(E)
- -

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IS0 10348:1993(E)
Contents
Page
1 scope . 1
2 Normative references . 1
3 Principle . 2
. 2
3.1 Flame atomic absorption spectroscopy (AAS) methodology
3.2 Potentiometric titration (PT) methodology . 2
4 Reliability . 2
........................................... 2
5 Safety and operational precautions
5.1 Hazard warnings . 3
5.2 Hazard information code system . 3
.................................................................. 3
5.3 Safety precautions
..........................................................
5.4 Operational precautions 3
6 Reagents . 4
5
7 Glassware .
8 Sampling and sample pretreatment . 5
8.1 Sampling and preservation . 5
6
8.2 Sample size and pretreatment .
9 Preparation of test sample . 7
9.1 Cyanogen iodide (CNI) treatment . 7
9.2 Concentration and digestion (Digestion A) . 8
9.3 Vigorous digestion (Digestion B) . 8
10 Analysis by atomic absorption spectroscopy (AAS) . 9
................................... 9
10.1 Special apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
................................... 9
10.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
...................... 9
11 Analysis by potentiometric iodide titration PT)
10
11 .I Special apparatus . . . . . . . . . .~.~.~.
0 IS0 1993
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mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
II

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IS0 10348:1993(E)
11.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
11.3 Calculations for titration methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Annex
A Preparation of reagent solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
A.1 Preparation of cyanogen iodide solution (CNI) (DANGER: << S >>
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
) 12
A.2 Preparation of silver standard solutions (0,5 mg/l, I,0 mg/l, 3,0
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
mg/l and 5,0 mg/l) for AAS method
A.3 Preparation of silver nitrate standard solutions (0,100 mol/l, 0,010
mol/l and 0,001 mol/l) for PT methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
A.4 Preparation of potassium iodide standard solutions (0,l mol/l, 0,Ol
mol/l and 0,001 mol/l) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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IS0 10348:1993(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
technical committees. Each member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of
...