Degradation of color photographic waste fix solution by anodic oxidation

✍ Scribed by Romas Ragauskas; Arvydas Dikčius; Tomas Vengris; Audrius Padarauskas

• Book ID: 102325655
• Publisher: Wiley (John Wiley & Sons)
• Year: 2003
• Tongue: English
• Weight: 107 KB
• Volume: 78
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.747

✦ Synopsis

Abstract

By use of a capillary electrophoretic method for anion analysis the anodic oxidation of thiosulfate, present in color photo bleach‐fix solutions, was investigated. In a specially constructed electrolysis cell with a cation‐exchange membrane separating the electrode chambers and with a carbon flow‐through three‐dimensional anode the two‐stage anodic oxidation of S~2~O~3~^2−^ anions was realized. In the first stage, S~2~O~3~^2−^ anions were oxidized to a maximal degree to an intermediate compound – tetrathionate (S~4~O~6~^2−^) – then S~4~O~6~^2−^ anions were oxidized to the sulfate (SO~4~^2−^), avoiding the decomposition of intermediate compounds and the formation of harmful sulfur compounds.

© 2002 Society of Chemical Industry