The reductive immobilization of aqueous Se(IV) by natural pyrrhotite

- The reduction of aqueous Se(IV) by natural pyrrhotite can be described by a pseudo-first-order equation.
- Phosphate can significantly inhibit Se(IV) reduction by natural pyrrhotite.
- HS− and Fe2+ dominate Se(IV) reduction by natural pyrrhotite at low and high pH, respectively.
- Se(0) is formed following Se(IV) reduction by natural pyrrhotite.