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ISO 10349-5:1992
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Photography -- Photographic-grade chemicals -- Test methods -- Part 5: Determination of heavy metals and iron content

This standard was last reviewed* in 2013.

*ISO standards are reviewed every five years.

Abstract

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.

 

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