An Improved Method for the Determination of Hydroquinone and Metol in Photographic Developers
A new method for the quantitative chemical analysis of hydroquinone and metol is suggested that is more rapid and, in some cases, more accurate than previous methods. — Molecular hydroquinone and methyl p-amino phenol are extracted from the developer at pH 8.0 to 8.5 with methyl acetate. The extract is dissolved directly in water and titrated with hydrochloric acid to determine metol, and then with iodine at pH 6.5 to 7.0 to determine the sum of the metol and the hydroquinone.
- Print ISSN
- 0097-5834
- Published
- 1946-11
- Content type
- Original Research
- DOI
- 10.5594/J12766
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