ETHYLENEDIAMINE-N,N'-DISUCCINIC ACID IRON SALT, METHOD FOR PRODUCING THE SAME, TREATING AGENT USING THE SAME AND USED FOR SILVER HALIDE PHOTOGRAPHIC PHOTOSENSITIVE MATERIAL, AND METHOD FOR TREATING

摘要

PROBLEM TO BE SOLVED: To provide a method for producing an ethylenediamine-N,N'-disuccinic acid iron salt, by which the by-production of insoluble compounds can be inhibited, and to provide a bleaching agent which has high stability and is used for treating photographic photosensitive materials. SOLUTION: This method for producing the ethylenediamine-N,N'-disuccinic acid iron salt, comprising reacting ethylenediamine-N,N'-disuccinic acid or its salt with an iron salt in a solvent, characterized by controlling the pH value of the reaction system to <=8. The obtained ethylenediamine-N,N'-disuccinic acid iron salt is used as a bleaching agent for treating photographic photosensitive materials.