Reference number
ISO 10349-3:1992
ISO 10349-3:1992
© ISO 2024
International Standard
ISO 10349-3:1992
Photography — Photographic-grade chemicals — Test methods — Part 3: Determination of matter insoluble in ammonium hydroxide solution
Edition 1
1992-12
1992-12
ISO 10349-3:1992
21260
Published
(Edition 1, 1992)
This publication was last reviewed and confirmed in 2023.
Therefore this version remains current.
Abstract
The method is based on weighing a test portion, dissolution in water, addition of ammonium oxalate solution, diammonium hydrogen phosphate solution and ammonium hydroxide solution, allowing to stand for at least 8 h, filtering out the precipitate through filter paper, transfer of the filter paper with precipitate to a prepared crucible, burning it over a gas burner, incineration of the residue in a furnace, cooling in a desiccator, and reweighing.