| Mineral: |
Magnetite |
| Reference: |
LSLCH17 |
| SCM Type: |
DDL - Diffuse Double Layer
|
| Ionic Strength: |
0.01 mol/L of
NaCl
|
| Site Type: |
»Fe-OH |
| PZC: |
5.43 |
| pK1: |
5.67 |
pK1°I=0 (Conversion to I = 0): |
5.63 |
pK12.31 nm−2 (normalized): |
6.56 |
| pK2: |
6.51 |
pK2°I=0 (Conversion to I = 0): |
6.47 |
pK22.31 nm−2 (normalized): |
5.62 |
| Site Density in nm-2: |
17.9100 |
| Original Site Density: |
17.91 sites / nm² surface
|
| Solid/Liquid Ratio in g/L: |
1.0 |
| pH Range: |
2-11 |
| Temperature in K: |
298.15 |
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
The acid−base titration of nanomagnetite at 0.01
mol/L NaCl solution was carried out by a titration apparatus (DL50 automatic titrator, Mettler Toledo).Typically, 0.04 g of nanomagnetite was put into 0.01 mol/L NaCl (40 mL) background electrolyte at T = 25 ± 1 °C, then purged the suspension with argon gas for 0.5 h to exhaust CO2(g). Adjusted the original pH of suspension to 2.0 using 0.5 mol/L HCl, and consequently the suspension was gently titrated to pH 11.0 using 0.5 mol/L NaOH titrant (0.001−0.1 mL). The surface
reactive site density was acquired by fitting titration data by FITEQL v2.6 mode. |
| |
