Table 1.
Colloidal silica (certified) reference materials used during method development and validation, and their relevant properties.
| Code | Reference Particle Diameter (nm) | Mass Fraction in Test Sample (g/kg) | Density (g/cm3) | Metrological Status |
|---|---|---|---|---|
| NS-0020A | 19.8 ± 0.5 | 3.6 | 1.9 | RM |
| ERM-FD100 | 20.1 ± 1.3 | 10 | 2.3 | CRM |
| ERM-FD304 | 33.0 ± 3.0 | 2.5 | 2.3 | CRM |
| NS-0050A | 49.7 ± 1.2 | 1.8 | 1.9 | RM |
| ERM-FD101b | 87 ± 8 | 2.5 | 2.0 | CRM |
| NS-0100A | 99.1 ± 2.4 | 1.3 | 1.9 | RM |
| ERM-FD305 1 | 135 | 1.5 | 2.0 | RM |
| ERM-FD306 1 | 135 | 0.1, 0.15, 1.5, 10 | 2.0 | RM |
| NS-0150A | 146 ± 4 | 1.3 | 1.9 | RM |
| NS-0200A | 206 ± 5 | 1.1 | 1.9 | RM |
| ERM-FD102 | 23.9 ± 2.0 and 88 ± 7 | 8.8 | 2.0 | CRM |
1 Certified reference material for zeta potential measurements, particle size value is an indication only.