In this study, potassium iodide (KI) was found to be capable of reducing selenium(VI) to selenium(IV). When KI was added to Se(VI) solution, the Se(VI) concentration rapidly decreased with an increase in the KI/Se(VI) molar ratio. By using the potential-pH equilibrium diagram for the selenium/water system, we confirmed that Se(VI) reduced to Se(IV) because the potential of the solution shifted to the stable Se(IV) region upon the addition of KI. This reduction accompanies the oxidation of I- to I3-. The reduction of Se(VI) by KI was found to be effective for concentrated Se(VI) solutions.
- Potassium iodide
- Potential-pH equilibrium diagram for the selenium/water system
ASJC Scopus subject areas
- Environmental Chemistry