ISO 10349-3-1992 PDF

Full title and description

Photography — Photographic-grade chemicals — Test methods — Part 3: Determination of matter insoluble in ammonium hydroxide solution (ISO 10349-3:1992). This International Standard specifies a laboratory test method to quantify the portion of a photographic-grade chemical that is insoluble in ammonium hydroxide solution, using dissolution, precipitation, filtration, ignition and gravimetric determination.

Abstract

The method is based on weighing a test portion, dissolving it in water, adding ammonium oxalate, diammonium hydrogen phosphate and ammonium hydroxide solutions, allowing the mixture to stand (at least 8 hours), filtering the precipitate, transferring the filter and precipitate to a prepared crucible, burning and incinerating the residue, cooling in a desiccator and reweighing to determine the insoluble matter.

General information

• Status: Published (International Standard; confirmed on review).
• Publication date: 30 December 1992 (Edition 1, 1992-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 37.040.30 (Photography — Photographic chemicals).
• Edition / version: Edition 1 (1992).
• Number of pages: 2.

Scope

Specifies a standardized gravimetric test method for determining matter insoluble in ammonium hydroxide solution in materials classified as photographic‑grade chemicals. The procedure is intended for quality control and specification verification of photographic chemical products and covers sample preparation, reagents, precipitation, filtration, ignition and calculation of results.

Key topics and requirements

• Definition of the test portion and required reagents (ammonium oxalate, diammonium hydrogen phosphate, ammonium hydroxide, water).
• Stepwise laboratory procedure: dissolution, reagent addition, standing period (≥ 8 h), filtration of precipitate, transfer to crucible.
• Ignition/incineration procedure and use of desiccator for cooling to constant mass.
• Gravimetric calculation to report the mass (and percentage) of insoluble matter.
• Requirements for equipment cleanliness, crucible preparation and repeatability to ensure reliable QC results.

Typical use and users

Used by photographic-chemical manufacturers, quality-control and analytical laboratories, material specification teams, and heritage/conservation laboratories that test photochemical reagents. It is applied when verifying supplier material conformity or during internal QC of photographic processing chemicals.

Related standards

ISO 10349 is a multipart series of test methods for photographic‑grade chemicals; other parts include tests for matter insoluble in water (Part 2), residue after ignition (Part 4), heavy metals and iron (Part 5), halide content (Part 6), alkalinity/acidity (Part 7), volatile matter (Part 8), reaction to ammoniacal silver nitrate (Part 9), sulfide content (Part 10), specific gravity (Part 11) and density (Part 12). Part 1 (General) was revised and republished as ISO 10349-1:2002.

Keywords

photography; photographic-grade chemicals; insoluble matter; ammonium hydroxide; gravimetric method; test method; QC; ISO 10349; analytical procedure.

FAQ

Q: What is this standard?

A: ISO 10349-3:1992 is an ISO test method that defines how to determine the fraction of a photographic-grade chemical that is insoluble in ammonium hydroxide solution by a controlled gravimetric procedure.

Q: What does it cover?

A: It covers specimen preparation, reagents, precipitation and filtration of insoluble material, ignition/incineration of the residue, cooling and reweighing, and the calculation/reporting of the insoluble-matter result.

Q: Who typically uses it?

A: Manufacturers of photographic chemicals, independent analytical and QC laboratories, standards and compliance teams, and conservation laboratories involved in photographic material assessment.

Q: Is it current or superseded?

A: The 1992 edition of ISO 10349-3 remains published and was last reviewed and confirmed (so it remains current) during ISO's periodic review process; the ISO bibliographic record indicates a confirmation in 2023. Users should check national or ISO catalogues for any later revisions before relying on the text for regulatory compliance.

Q: Is it part of a series?

A: Yes — ISO 10349 is a multipart series of test methods for photographic-grade chemicals (Parts 1–12 cover various specific tests). Part 1 (General) was updated in 2002 as ISO 10349-1:2002.

Q: What are the key keywords?

A: Insoluble matter, ammonium hydroxide, gravimetric determination, photographic chemicals, ISO 10349, test method, quality control.