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ISO 10349-5:1992
M00000320
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ISO 10349-5:1992 Photography -- Photographic-grade chemicals -- Test methods -- Part 5: Determination of heavy metals and iron content
standard by International Organization for Standardization, 12/01/1992
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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.