ISO 10349-10:1992

Photography - Photographic-grade chemicals - Test methods - Part 10: Determination of sulfide content

The method is based on weighing a test portion, dissolution in water, transfer to one of the Nessler colour-comparison cylinders, pipetting the volume of sulfide standard into the second Nessler colour-comparison cylinder, addition of alkaline lead solution, making up with water, mixing thoroughly, and comparing the colour and clarity of the two solutions.

Photographie — Produits chimiques de qualité photographique — Méthodes d'essai — Partie 10: Détermination de la teneur en sulfure

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 10349-10:1992 specifies a comparative chemical test method for the determination of sulfide content in photographic‑grade chemicals. The standard is part of the ISO 10349 series on photographic‑grade chemical test methods and defines a simple, visual, color‑comparison procedure using Nessler colour‑comparison cylinders, a prepared sulfide standard, and an alkaline lead reagent. The method is intended for routine quality control of chemicals used in photographic processing and related materials.

Key topics and requirements

• Scope: A general test method to determine sulfide content in photographic‑grade chemicals (ISO 10349 series context).
• Sample and reagents:
  • Test portion: 2.0 g ± 0.1 g dissolved in 25 ml water.
  • Sulfide standard: prepared from sodium sulfide nonahydrate (procedure yields a labeled standard; the document specifies a standard concentration of 0.001 mg S/ml).
  • Alkaline lead solution: prepared by combining sodium hydroxide solution with lead acetate solution until a precipitate redissolves, then adding a small excess (lead reagent is used with care because of health hazards).
• Apparatus: Two matched Nessler colour‑comparison cylinders (50 ml capacity each).
• Procedure:
  • Transfer the dissolved sample into one Nessler cylinder.
  • Pipette the specified volume of sulfide standard into the matched cylinder (volumes depend on the test limit; consult the standard’s table for exact volumes).
  • Add 2 ml alkaline lead solution to each cylinder, make up to the 50 ml mark, mix thoroughly.
  • Compare colour and clarity of the two solutions visually. Any darkening in the test solution must not exceed that of the treated sulfide standard.
• Safety: Lead acetate is identified as a potential carcinogen and reproductive hazard. Follow ISO 10349‑1 for general hazard guidance and laboratory safety.

Applications and users

• Used for quality control of photographic‑grade chemicals (suppliers and manufacturers).
• Suitable for chemical analysis laboratories performing incoming inspection or routine batch testing of photographic reagents.
• Useful to conservators and analytical chemists verifying impurity levels that can affect photographic processing quality.
• Typical users: laboratory technicians, QC managers, standards compliance personnel, and technical auditors in photographic chemical production.

Related standards

• ISO 10349‑1:1992 - Photography - Photographic‑grade chemicals - Test methods - Part 1: General (hazard codes, glassware and general requirements).
• Other parts of ISO 10349 address insolubles, heavy metals, halides, alkalinity, and related chemical tests.

Keywords: ISO 10349-10, sulfide content determination, photographic‑grade chemicals, Nessler colour‑comparison, alkaline lead reagent, sulfide standard, photography chemical QC.

Standards Content (Sample)

INTERNATIONAL
IS0
STANDARD
10349-10
First edition
1992-I 2-l 5
Photography - Photographic-grade
chemicals - Test methods -
Part 10:
Determination of sulfide content
Photographie - Produits chimiques de quake photographique -
Mbthodes d’essai -
Partie 10: D&termination de la teneur en sulfure
Reference number
IS0 10349-l 09 992(E)
IS0 10349-10:1992(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-l 0 was prepared by Technical Commit-
tee 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: De termination of matter insoluble in ammonium hydroxide
solution
- Part 4: Determination of residue after ignition
- Part 5: De termination of heavy metals and iron content
- Part 6: Determination of halide content
- Part 7: Determination of alkalinity or acidity
- Part 8: Determination of volatile matter
- Part 9: Reaction to ammoniacal silver nitrate
- Part IO: 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 10349-10:1992(E)
- Part I 7: Determination of specific gravity
- Part 12: Determination of density

This page intentionally left blank

INTERNATIONAL STANDARD
IS0 10349-10:1992(E)
Photography - Photographic-grade chemicals - Test
methods -
Part 10:
Determination of sulfide content
4.1 Sulfide standard (0,001 mg S/ml).
1 Scope
Dissolve I,5 g of sodium sulfide nonahydrate
This part of IS0 10349 specifies a general test
(Na,SSH,O) (DANGER: < B >) in 500 ml of
method for the determination of the sulfide content
water in a 1 litre one-mark volumetric flask, then make
of photographic-grade chemicals.
up to the mark with water and mix well. Pipette 5 ml
of this solution into a second 1 litre one-mark
volumetric flask, make up to the mark with water, mix
well and label this solution “sulfide standard”.
2 Normative reference
T
...