ISO 10349-5:1992 Preview
Photography -- Photographic-grade chemicals -- Test methods -- Part 5: Determination of heavy metals and iron content
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
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.