Fig. 2. The pH and Eh values of Lillis soil suspensions on Day 0 (plus symbols) and Day 8 (small symbols: controls [closed circles and open triangles]; autoclaved [cross-hatched]; chloramphenicol [open squares]). Theoretical EH–pH values for water in equilibrium with H2 gas partial pressure = 2.53 kPa at the initial pH are also indicated (diamonds).