Selenite ions would have inhibition effect on mercury re-emission.

The inhibition mechanism is different under acidic and alkaline condition.

The inhibition is due to the formation of ${\text{HgSeO}}_3{\text{SO}}_3^{2-}$ and $\text{Hg}{({\text{SeO}}_3)}_2^{2-}$ in alkaline condition.

The inhibition is due to the formation of HgSe in acidic condition.

The mercury reduction could be inhibited due to the formation of HgSeO₃Cl^-${\text{HgSeO}}_3{\text{Cl}}^{-}$ and ${\text{HgSeO}}_3{\text{Cl}}_2^{2-}$.