ISO 3943:1993
(Main)Photography — Processing chemicals — Specifications for anhydrous sodium acetate
Photography — Processing chemicals — Specifications for anhydrous sodium acetate
Establishes criteria for the purity of photographic-grade anhydrous sodium acetate and describes the tests to be used to determine the purity. The test methods are concerned with assay, insoluble matter content, heavy metals content, iron content, halides content, alkalinity, acidity, appearance of solution.
Photographie — Produits chimiques de traitement — Spécifications pour l'acétate de sodium anhydre
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Standards Content (Sample)
INTERNATIONAL
STANDARD
Second edition
1993-02-0 1
Photography - Processing chemicals -
Specifications for anhydrous sodium acetate
Photographje - Produits chimiques de traitement - Specifications pour
I’acktate de sodium anhydre
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Reference number
-- ISO 3943: 1993(E)
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ISO 3943:1993(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, govern-
mental 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 Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 3943 was prepared by Technical Committee
ISO/TC 42, Photography.
This second edition cancels and replaces the fit-st edition
(ISO 3943:1976), which has been technically revised.
0 ISO 1993
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronie or mechanical, including photocopying and micr ofilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISO 3943:1993(E)
Introduction
0.1 This International Standard is one of a series that establishes cri-
teria of purity for chemicals used in processing photographic materials.
General test methods and procedures cited in this International Stan-
dard are compiled in Parts 1, 3, 5, 6 and 7 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 ap-
propriate. Normal precautions 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 re-
quirements for the suitability of a photographit-grade Chemical. The
tests correlate with undesirable photographic effects. Purity require-
ments 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 de-
scribed 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. Identity tests have been included whenever a possibility
exists that another Chemical or mixture of chemicals could pass the
other tests.
All requirements tisted in clause 4 are mandatory. The physical ap-
pearance of the material and any footnotes are for general information
only and are not patt of the requirements.
. . .
Ill
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ISO 3943:1993(E)
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 specifi-
cation shall prevail. Where a requirement states “to pass test”, how-
ever, alternative methods shall not be used.
iv
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INTERNATIONAL STANDARD ISO 3943:1993(E)
Photography - Processing chemicals - Specifications for
anhydrous sodium acetate
ISO 10349-6:1992, Photography - Photographit- ’
1 Scope
grade chemicals - Test methods - Part 6: Determi-
nation of halide content.
This International Standard establishes criteria for
the purity of photographit-grade anhydrous sodium
ISO 10349-7:1992, Photography - Photographic-
acetate and describes the tests to be used to deter-
grade chemicals - Test methods - Part 7: Defermi-
mine the purity.
nation of alkalinity or acidity.
2 Normative references
3 General
The following Standards contain provisions which,
through reference in this text, constitute provisions
3.1 Physical properties
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All stan-
Anhydrous sodium acetate (CH,COONa) is a white
dards are subject to revision, and Parties to
powder or grey-white flakes. lt has a relative mol-
agreements based on this International Standard
ecular mass of 82,03.
are encouraged to investigate the possibi
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