Figure 2 Sed Geo 94
Figure 2. pH-pE(Eh) diagram for Fe species in seawater (1 atm, 25 °C, 35 ppt. salinity, total dissolved sulfur species: 28 mM (activity coefficient, 0.12; Garrels and Christ, 1965, p.l03). The area of interest is within the stability field of water-- below the oxidation of H2O to O2, and above reduction of H2O to H2.
Shaded areas show mineral phase stable at designated concentrations of dissolved Fe.
Lightly shaded areas indicate region in which mineral dissolves until concentrations observed under some anoxic conditions are reached.
Reduction of SO42- to H2S and HS- (concentration independent) is shown by the long dashes; reduction of NO3 to N2 is indicated by the line of short dashes (concentration independent ).
Solubility of Fe species is calculated at approximate oxic (10-9 M; Gordon et al., 1982) and anoxic ( 10-6 M; Jacobs et al., 1987) concentrations.
Eh-Ph-Fe

Graph Reader set for Net 4.7.

GRAPH READER
Eh in voltsPe
pH[H+] in ppm
Log PO2
PIXEL READER
Pixel X
Pixel Y


For other Browsers, reset Max-Min boxes
using values from Pixel reader.

Graph Settings (RESETABLE)
Min X
Min Y
Max X
Max Y