Fig. 2.

Interactions between dissolved gaseous Hg(0) (1.2 nM) and reduced or oxidized Elliott soil HA. (A) Purgeable Hg(0) measured at 4 h at varying HA concentrations; the open triangles and asterisks represent experiments performed in the presence of 100 nM SnCl₂ and ascorbic acid, before the addition of Hg(0). (B) Reaction kinetics performed at a fixed HA concentration of 5 mg/L.