Mineral: |
Ferrihydrite |
Reference: |
TSPG13 |
SCM Type: |
CDM - (CD-)MUSIC
(C1: 1.15 F/m2, C2: 0.9 F/m2) |
Ionic Strength: |
0.01 mol/L of
NaNO3
|
Site Type: |
»Fe-triply |
PZC: |
|
pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
7.93 |
pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
Site Density in nm-2: |
1.5500 |
Original Site Density: |
1.55 sites / nm² surface
|
Solid/Liquid Ratio in g/L: |
|
pH Range: |
|
Temperature in K: |
|
Method for Site Density: |
Geometrical Calculation |
Method for Protolysis: | Literature |
Fit Method: | FITEQL |
Comment: |
The total density of the »FeOH and »Fe3O groups was set to 7.8 sites/nm2 using a molecular weight of ferrihydrite of 89 g/mol and a specific surface area of 650 m2/g [HV09]; triply coordinated »Fe3O groups accounted for 20% of the proton charging whereas singly coordinated »FeOH groups accounted for the remaining 80%; »Fe(s1)-OH is a very strong affinity site (0.1 % of the total number of sites); »Fe(s2)-OH (0.9 % of the total number of sites); »Fe(s)-OH (1 % of the total number of sites) |
|