Determination of oxide ions in aluminum chloride-alkali chloride melts by Karl Fischer titration

The precise determination of oxide ions in acidic aluminum chloride-alkali chloride melts is important for the control of alloy composition in the electrodeposition of aluminum-manganese alloys. Karl Fischer titration was applied to the determination of oxide ions in the acidic melts (57-63 mol % AlCl 3 ). Oxide ions were found to be capable of reacting quantitatively with the Karl Fischer reagent when a melt sample was directly injected into the reagent. Oxide ions in eutectic AlCl 3 -NaCl-KCl melts (61:26:13 mol %) were determined with a relative standard deviation of less than 4%