ISO 3619:1994
(Main)Photography — Processing chemicals — Specifications for ammonium thiosulfate solution
Photography — Processing chemicals — Specifications for ammonium thiosulfate solution
Cancels and replaces the first edition (1976). Establishes criteria for the purity of photographic-grade ammonium thiosulfate solution and specifies the tests to be used to determine the purity.
Photographie — Produits chimiques de traitement — Spécifications relatives au thiosulfate d'ammonium en solution
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Standards Content (Sample)
INTERNATIONAL
ISO
STANDARD
3619
Second edition
1994-12-15
Photography - Processing chemicals -
Specifications for ammonium thiosulfate
solution
Photographie - Produits chimiques de traitemen t - Spkifica tions relatives au
thiosulfa te d ‘ammonium en Solution
Reference number
ISO 3619:1994(E)
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ISO 3619:1994(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Esch 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. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 3619 was prepared by Technical Committee
ISOflC 42, Photography.
This second edition cancels and replaces the first edition (ISO 3619:1976),
which has been technically revised.
0 ISO 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized In any form or by any means, electronie or mechanical. rncluding photocopying and
microfilm, without Permission In writing from the publisher.
International Organization for Standardization
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Printed in Switzerland
ii
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ISO 3619:1994(E)
0 ISO
Introduction
0.1 This International Standard is one of a series that establishes criteria
of purity for chemicals used in processing photographic materials. General
test methods and procedures cited in this International Standard are
compiled in Parts 1, 3, 4, 5, IO, 11 and 12 of ISO 10349.
This International Standard is intended for use by individuals with a
working knowledge of analytical techniques, which may not always be the
case. Some of the procedures utilize caustic, toxic or otherwise hazardous
chemicals. Safe laboratory practice for the handling of chemicals requires
the use of safety glasses or goggles, rubber gloves and other protective
apparel such as face masks or aprons where appropriate. Normal pre-
cautions required in the Performance of any Chemical procedure are to be
exercised at all times but care has been taken to provide warnings for
hazardous materials. Hazard warnings designated by a letter enclosed in
angle brackets, < >, are used as a reminder in those Steps detailing
handling operations and are defined in ISO 10349-1. More detailed
information regarding hazards, handling and use of these chemicals may
be available from the manufacturer.
0.2 This International Standard provides Chemical and physical require-
ments for the suitability of a photographit-grade Chemical. The tests
correlate with undesirable photographic effects. Purity requirements are
set as low as possible consistent with these photographic effects. These
criteria are considered the minimum requirements necessary to assure
sufficient purity for use in photographic processing solutions, except that if
the purity of a commonly available grade of Chemical exceeds photographic
processing requirements and if there is no economic penalty in its use, the
purity requirements have been set to take advantage of the availability of
the higher-quality material. Every effort has been made to keep the
number of requirements to a minimum. Inert impurities are limited to
amounts which will not unduly reduce the assay. All tests are performed
on samples “as received” to reflect the condition of materials furnished for
use. Although the ultimate criterion for suitability of such a Chemical is its
successful Performance in an appropriate use test, the shorter, more
economical test methods described in this International Standard are
generally adequate.
Assay procedures have been included in all cases where a satisfactory
method is available. An effective assay requirement serves not only as a
safeguard of Chemical purity but also as a valuable complement to the
identity test. ldentity tests have been included whenever a possibility
exists that another Chemical or mixture of chemicals could pass the other
tests.
All requirements listed in clause 4 are mandatory. The physicai appearance
sf the material and any footnotes are for general Information only and are
not part of the requirements.
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ISO 3619:1994(E) 0 ISO
0.3 Efforts have been made to employ tests which are capable of being
run in any normally equipped laboratory and, wherever possible, to avoid
tests which require highly specialized equipment or techniques.
Instrumental methods have been specified only as alternative methods or
alone in those cases where no other satisfactory method is available.
Over the past few years, great improvements have been made in
instrumentation for various analyses. Where such techniques have
equivalent or greater precision, they may be used in place of the tests
described in this International Standard. Correlation of such alternative
procedures with the given method is the responsibility of the User. In case
of disagreement in results, the method called for in the specification shall
prevail. Where a requirement states “to pass test ”, however, alternative
methods shall not be used.
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INTERNATIONAL STANDARD o ISO ISO 3619:1994(E)
Photography - Processing chemicals - Specifications for
ammonium thiosulfate solution
1 Scope 3 General
This International Standard establishes criteria for the
3.1 Physical properties
purity of photographit-grade ammonium thiosulfate
Solution and specifies the tests to be used to
Ammonium thiosulfate, (NH4&03, exists as a clear
determine the purity.
colourless Solution; crystallization may occur at
reduced temperatures (cold weather). lt has a relative
molecular mass of 148,20.
2 Normative references
The following Standards contain provisions which, 3.2 Hazardous properties
through reference in this text, constitute provisions of
Ammonium thiosulfate Solution is not hazardous
this International Standard. At the time of publication,
when handled with normal precautions. Ammonium
the editions indicated were valid. All Standards are
thiosulfate should not be mixed with large volumes of
subject to revision, and Parties to agreements based
strong acids or alkalis.
on this International Standard are encouraged to
investigate the possibility of applying the most recent
editions of the Standards indicated below. Members
of IEC and ISO maintain registers of currently valid 3.3 Storage
International Standards.
Ammonium thiosulfate solution shall be stored in a
ISO 10349-1: 1992, Photography - Photographic- closed Container at room temperature.
grade chemicals - Test methods - Part 1: General.
ISO 10349-3: 1992, Photography - Photographic-
grade chemicals - Test methods - Part 3: Deter-
4 Requirements
mination of matter insoluble in ammonium h ydroxide
A summary of the requirements is shown in table 1.
Solution.
ISO 10349-4: 1992, Photography - Photographic-
grade chemicals - Test methods - Part 4: Deter-
mination of residue after ignition.
5 Reagents and glassware
All reagents, materials and glassware shall conform to
ISO 10349-5: 1992, Photography - Photographic-
the requirements specified in ISO 10349-1 unless
grade chemicals - Test methods - Part 5: Deter-
otherwise noted. The hazard warning Symbols used
mination of heavy metals and iron content.
as a reminder in those Steps detailing handling oper-
ations are defined in ISO 10349-1. These Symbols are
ISO 10349-10: 1992, Photography - Photographic-
used to provide information to the user and are not
grade chemicals - Test methods - Part 70: Determi-
meant to provide conformance with hazardous
nation of sulfide con ten t.
labelling requirements, as these vary from country to
country.
ISO 10349-11 :1992, Photography - Photographic-
grade chemicals - Test methods - Part 11: Determi-
nation of specific gravity.
6 Sampling
ISO 10349-12: 1992, Photography - Photographic-
grade chemicak - Test methods - Part 72: Determi-
nation of density. See ISO 10349-1.
1
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ISO 3619:1994(E) 0 ISO
Table 1 - Summary of requirements
International Standard in
Test Limit Subclause
which test method is given
ISO 3619
Essay las (NH,)2S2031 53,0 % (WZ/UZ) min. 7.1
61,0 % (m/m) max.
Alkalinity (as NH,OH) 0,3 % (m/m) min. 7.1 ISO 3619
1,5 % (m/m) max.
1 % (m/m) max. 7.1
Sulfites [as (NH,pO,l
ISO 3619
Insoluble matter (as precipitate of 0,2 % (m/m) max. ISO 10349-3
7.2
Calcium and magnesium in ammonium
hydroxide)
0,2 % (m/m) max. ISO 10349-4
Residue after ignition 7.3
ISO 10349-5
0,001 % (m/m) max. 7.4
Heavy metals (as Pb)
Iron (Fe) 0,001 % (m/m) max. 7.5 ISO 10349-5
0,000 25 % (m/m) max.
Sulfides (as S*-)
7.6 ISO 10349-10
ISO 10349-11
Specific gravity (at 20 “C) 1,290 min. 7.7.1
1,34
...
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