| 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(s)-OH |
| PZC: |
|
| pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
8.53 |
| pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
| Site Density in nm-2: |
6.2500 |
| Original Site Density: |
6.25 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) |
| |
| 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(s2)-OH |
| PZC: |
|
| pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
8.53 |
| pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
| Site Density in nm-2: |
6.2500 |
| Original Site Density: |
6.25 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) |
| |
| 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(s1)-OH |
| PZC: |
|
| pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
8.53 |
| pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
| Site Density in nm-2: |
6.2500 |
| Original Site Density: |
6.25 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) |
| |
| 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-singly |
| PZC: |
|
| pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
8.53 |
| pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
| Site Density in nm-2: |
6.2500 |
| Original Site Density: |
6.25 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) |
| |
| 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(w)-OH |
| PZC: |
|
| pK1: |
8.1 |
pK1°I=0 (Conversion to I = 0): |
8.06 |
pK12.31 nm−2 (normalized): |
8.53 |
| pK2: |
|
pK2°I=0 (Conversion to I = 0): |
|
|
| Site Density in nm-2: |
6.2500 |
| Original Site Density: |
6.25 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) |
| |
