ISO 10349-9:1992

Photography - Photographic-grade chemicals - Test methods - Part 9: Reaction to ammoniacal silver nitrate

The method is based on weighing a test portion, dissolving it in water, transfer of the solution to each of two Nessler colour-comparison cylinders, preparing a test solution by adding freshly prepared ammoniacal silver nitrate solution to one of the Nessler cylinders and mixing well, preparing a blank solution by adding ammonium hydroxide solution and water to the other Nessler cylinder and mixing well, allowing the solutions to stand for 2 min, and comparing the colour and turbidity of the two solutions.

Photographie — Produits chimiques de qualité photographique — Méthodes d'essai — Partie 9: Réaction au nitrate d'argent ammoniacal

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 10349-9:1992 is an international standard specifying a test method for evaluating the reaction of photographic-grade chemicals to ammoniacal silver nitrate. This part of the ISO 10349 series focuses on a chemical reactivity test crucial for ensuring the quality and purity of photographic chemicals. The standard outlines a precise procedure for comparing the color and turbidity produced when a test solution containing the chemical reacts with freshly prepared ammoniacal silver nitrate against a blank solution. This comparison helps detect impurities or reactions that might affect photographic processing.

Key Topics

• Scope and Methodology
  The method involves weighing a sample of the photographic-grade chemical, dissolving it in water, and dividing the solution into two Nessler color-comparison cylinders. One cylinder is treated with ammoniacal silver nitrate solution, while the other serves as a blank with ammonium hydroxide and water. After standing for 2 minutes, the color and turbidity of the solutions are compared to detect any reaction.

• Chemicals and Reagents

  • Freshly prepared ammoniacal silver nitrate
  • Ammonium hydroxide solution (NH₄OH)
  • Distilled water for dissolving the test portion

• Safety Considerations
  The standard emphasizes proper handling of silver nitrate and ammonium hydroxide, both hazardous chemicals. Disposal instructions highlight the prevention of explosive compound formation such as silver azide or feather powder.

• Test Reporting
  The test report must include the method used, detailed test results, all relevant operating conditions, and identification information for traceability. Incidents affecting results must be documented.

Applications

ISO 10349-9:1992 is essential in the photographic materials and chemicals industry where purity and chemical stability of photographic-grade chemicals are critical. Its practical applications include:

• Quality Control and Assurance
  Photographic chemical manufacturers use this test to verify the reactivity and purity of raw materials and finished products, ensuring they meet stringent photographic standards.

• Chemical Reactivity Assessment
  This method helps detect contaminants or undesirable chemical interactions that could degrade photographic emulsions or affect image quality.

• Compliance and Standardization
  Laboratories conducting chemical analysis for photographic products rely on ISO 10349-9 to align with international quality standards, facilitating global trade and product acceptance.

• Research and Development
  R&D teams can apply this standardized test to screen new chemical formulations and assess their compatibility with photographic processes.

Related Standards

ISO 10349-9 is part of a comprehensive series addressing test methods for photographic-grade chemicals:

• ISO 10349-1: General requirements for test methods
• ISO 10349-2: Determination of matter insoluble in water
• ISO 10349-3: Determination of matter insoluble in ammonium hydroxide solution
• ISO 10349-5: Determination of heavy metals and iron content
• ISO 10349-7: Determination of alkalinity or acidity
• ISO 10349-10: Determination of sulfide content
• ISO 10349-11: Determination of specific gravity

Together, these parts offer a full chemical characterization framework critical for controlling photographic-grade chemical quality.

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Keywords: ISO 10349-9, photographic-grade chemicals, ammoniacal silver nitrate, photographic chemical test methods, chemical reactivity, silver nitrate reaction, photographic quality control, Nessler color-comparison cylinder, photographic materials testing, ISO photographic standards.

Standards Content (Sample)

INTERNATIONAL
ISO
STANDARD
10349-9
First edition
19924 2-l 5
Photography - Photographit-grade
chemicals - Test methods -
Part 9:
Reaction to ammoniacal silver nitrate
Photographie - Produits chimiques de qualitk photographique -
Methodes d ’essai -
Partie 9: R6action au nitra te d ’argen t ammoniacal
Reference number
ISO 10349=9:1992(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 10349-9 was prepared by Technical Committee
lSO/TC 42, Photography.
ISO 10349 consists of the following Parts, under the general title Pho-
tography - Photographit-grade chemicals - Test methods:
- Part 1: General
- Part 2: Determination of matter insoluble in wa ter
- Part 3: Determination of matter insoluble in ammonium hydroxide
Solution
- Part 4: Determination of residue after ignition
- Part 5: Determination of heavy metals and iron content
- Part 6: De fermination of halide tonten t
- Part 7: Determination of alkalinity or acidity
- Part 8: Determination of vola tile matter
- Part 9: Reaction to ammoniacal silver nitrate
- Part 10: Determination of sulfide con tent
0 ISO 1992
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 microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
ISO 10349=9:1992(E)
- Part 11: Determination of specific gravity
- Part 12: Determination of density

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INTERNATIONAL STANDARD ISO 10349=9:1992(E)
- Photographit-grade chemicals - Test
Photography
methods -
Part 9:
Reaction to ammoniacal silver nitrate
4 Reagents
1 Scope
See ISO 10349-1 for general requirements.
This part of ISO 10349 specifies a general test
method for the determination of the reaction to am-
moniacal silver nitrate, for photographit-
...