ISO 10349-5:1992

Photography - Photographic-grade chemicals - Test methods - Part 5: Determination of heavy metals and iron content

The method is based on preparation of test samples and heavy metals standard solutions, preconditioning them, addition of sodium sulfide solution (for determination of heavy metals) or 1,10-phenanthroline reagent (for determination of iron), dilution with water, mixing well, transfer to two Nessler colour-comparison cylinders, and comparing the colour of both solutions.

Photographie — Produits chimiques de qualité photographique — Méthodes d'essai — Partie 5: Détermination des teneurs en métaux lourds et en fer

General Information

• Status: Published
• Publication Date: 29-Dec-1992
• ICS: 37.040.30 - Photographic chemicals
• Technical Committee: ISO/TC 42 - Photography
• Drafting Committee: ISO/TC 42 - Photography
• Current Stage: 9093 - International Standard confirmed
• Start Date: 05-Jun-2023
• Completion Date: 13-Dec-2025

Overview

ISO 10349-5:1992 - Photography - Photographic‑grade chemicals - Test methods - Part 5: Determination of heavy metals and iron content - specifies a visual colour‑comparison procedure for detecting and limiting heavy metals (expressed as Pb) and iron in photographic‑grade chemicals. The method uses prepared test samples and standard solutions, preconditioning, chemical reagents (sodium sulfide for heavy metals; 1,10‑phenanthroline for iron), dilution to volume, and comparison in paired Nessler colour‑comparison cylinders (or optionally by spectrometer).

Key topics and requirements

• Scope: General test method for heavy metals and/or iron content in photographic chemicals; refer to ISO 10349‑1 for hazard codes and general requirements.
• Standards and reagents: Preparation of heavy‑metals standard (0.010 mg Pb/ml from lead acetate trihydrate) and iron standard (0.010 mg Fe/ml from ferrous ammonium sulfate) as defined in the standard.
• Sample preparation options: Residue after ignition, dilution with water, or dilution following acid treatment (clauses 7.1–7.3).
• Preconditioning: p‑nitrophenol indicator used to adjust pH to neutral range before reagent addition; specific acid/base adjustments described in the text.
• Analytical reactions:
  • Heavy metals: addition of sodium sulfide produces a colour for comparison.
  • Iron: addition of 1,10‑phenanthroline reagent produces an orange complex for comparison.
• Measurement: Transfer preconditioned test and standard solutions to matched Nessler cylinders (50 ml) and compare visually. Any colour in the test solution must not exceed that of the corresponding standard. Colour comparisons may be made with a spectrometer for greater objectivity.
• Reporting: Specify the method variant used, test result, and any non‑standard operating details or incidents that could affect results.

Applications and users

• Quality control and incoming inspection of photographic‑grade chemicals (developers, fixers, toners, etc.)
• Chemical manufacturers and suppliers ensuring product compliance with photographic purity requirements
• Analytical and photographic testing laboratories performing acceptance testing and routine monitoring
• Conservators and archival labs concerned with contamination risks from heavy metals or iron in processing chemicals

Related standards

• ISO 10349‑1:1992 - General requirements and hazard codes for ISO 10349 test methods
• ISO 10349 other parts (e.g., Part 4: Determination of residue after ignition) which provide complementary sample‑preparation procedures referenced by Part 5

Keywords: ISO 10349-5, photographic‑grade chemicals, heavy metals determination, iron content, Nessler colour‑comparison cylinders, sodium sulfide, 1,10‑phenanthroline, photographic chemical testing.

Standards Content (Sample)

INTERNATIONAL IS0
10349-5
STANDARD
First edition
1992-12-15
- Photographic-grade
Photography
chemicals - Test methods
Part 5:
Is and iron
Determination of heavy meta
content
- Produits chimiques de qualit photographique -
Photographie
Mbthodes d’essai -
Partie 5: Dgtermination des teneurs en m&aux lourds et en fer
Reference number
IS0 10349-5:1992(E)
IS0 10349=5:1992(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
(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 IS0 10349-5 was prepared by Technical Committee
lSO/TC 42, Photography.
IS0 10349 consists of the following parts, under the general title Pho-
tography - Photographic-grade chemicals - Test methods:
- Part I: General
- Part 2: Determination of matter insoluble in water
- Part 3: Determination of matter insoluble in ammonium hydroxide
solution
- Part 4: De termination of residue after ignition
- Part 5: Determination of heavy metals and iron content
- Part 6: Determination of halide con tent
- Part 7: Determination of alkalinity or acidity
- Part 8: Determination of volatile matter
- Part 9: Reaction to ammoniacal silver nitrate
- Part 10: Determination of sulfide con tent
0 IS0 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
IS0 10349=5:1992(E)
- Part I 1: Determination of specific gravity
- Part 12: Determination of density

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INTERNATIONAL STANDARD IS0 10349=5:1992(E)
Photography - Photographic-grade chemicals - Test
methods -
Part 5:
Determination of heavy metals and iron content
3 Hazards
1 Scope
See IS0 10349-I for general hazard warnings and for
This part of IS0 10349 specifies a general test
details of the hazard code system used in this part of
method for the determination of the heavy metals
IS0 10349.
and/or iron content of photographic-grade chemicals.
NOTE 1 If the analysis concerns only heavy metals or
4 Reagents
iron, then only that diluted standard solution (8.1) need be
prepared.
See IS0 10349-I for general requirements.
Heavy-metals standard (0,010 mg Pb/ml).
4.1
Dissolve I,83 g of lead acetate trihydrate
[Pb(CH,COO),m3H,O] (DANGER: << S >>) in 500 ml
2 Normative references
of water in a 1 litre one-mark volumetric flask. Make
up to the mark with water, stopper the flask and in-
vert it four or five times for proper mixing. Pipette a
The following standards contain provisions which,
10 ml aliquot of this solution into another 1 litre one-
through reference in this text, constitute provisions
mark volumetric flask. Make up to the mark with wa-
of this part of IS0 10349. At the time of publication,
ter and mix well. Label this solution “heavy-metals
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based standard”.
on this part of IS0 10349 are encouraged to investi-
gate the possibility of applying the most recent edi-
4.2 Iron standard (0,010 mg Fe/ml).
tions of the standards indicated below. Members of
IEC and IS0 maintain registers of currently valid Dissolve 0,70 g of ferrous ammonium sulfate
International Standards. hexahydrate [Fe(NH,)2(S04)2m6H,0] in 500 ml of wa-
ter in a 1 litre one-mark volumetric flask. Add 20 ml
IS0 10349-I : 1992, Photography - Photographic- of dilute sulfuric acid (1 + 15)‘) and then make up to
grade chemicals - Test methods - Part I: General. the mark with water. Stopper the flask and mix well.
Pipette a 10 ml aliquot of this solution into a 100 ml
IS0 10349-4: 1992, Photography - Photographic- one-mark volumetric flask, make up to the mark with
grade chemicals - Test methods - Part 4: Deter- water, and mix well. Label this solution “iron
mination of residue after ignition. standard”.
1) This can be prepared from sulfuric acid, p z I,84 g/ml (DANGER: -CC C >>I.

IS0 10349=5:1992(E)
4.3 p-l\litrophenol indicator 7.1 Dilution of the residue after ignition
Dissolve 2,5 g of p-nitrophenol in 500 ml of water in
Take the residue remaining after igni
...