Figure 4.
Lifetime of a spherical uraninite grain (200 μm diameter) for different partial pressures of oxygen relative to present atmospheric oxygen (PAL) for various solution pH. Calculated according to Ono (2001) with ALK = 1.3 mM and an oxygen dependence of n = 0.27; pCO2 is 1 times PAL for pH = 8.3 and roughly 2200 times PAL for pH = 5.0.