Note on Metol Analysis in Photographic Developers

The Method of Brunner, Means and Zappert¹ for the determination of metol in Ansco Color Positive first developer, A-502, was found by us to give a titration curve with no true inflection point. Instead, there was a region of about 0.5 ml in which the inflection might occur; therefore, the error in the determination may be quite large. By substituting acetic acid for water as solvent for the titration, and 0.1 N sulfuric or perchloric acid in acetic acid for the conventional 0.1 N hydrochloric acid, a better inflection point may be obtained. No changes except those already mentioned were made in the procedure given by Brunner, Means and Zappert.

Print ISSN

0898-042X

Published

1950-04

Content type

Original Research

DOI

10.5594/J05235