Concentrations of Fe 2+ in synthetic AMD during oxidation with ferrate using UV-Vis spectroscopy. However, the results showed that Fe 2+ can be oxidized by ferrate ions at the oxidation rate of 99.95% in 30 min at pH=3. Both the concentrations of Fe 2+ (complexed with 1, 10-phenanthroline) and ferrate (VI) solution were determined using UV-Vis spectrophotometer.