Table 5.
Evaluation of sample preparation protocols based on the medians of the Fmin, Fmax, and aspect ratio (AR) distributions for (a) constituent particles and (b) agglomerates of anatase E171 material E171-06. For the constituent particles, expanded measurement uncertainties (Ucx, k = 2) are estimated based on the validation study of Verleysen et al. [59] for representative test material NM-100.
| (a) Constituent particles | |||||||
| Protocol | P1 | P2 | P3 | P4 | P5 | P6, rep 1 | P6, rep 2 |
| Fmin (nm) | 89 ± 8 | 97 ± 8 | 98 ± 8 | 90 ± 8 | 91 ± 8 | 88 ± 7 | 85 ± 7 |
| Fmax (nm) | 105 ± 10 | 119 ± 11 | 119 ± 11 | 106 ± 10 | 110 ± 10 | 105 ± 10 | 100 ± 9 |
| AR | 1.16 ± 0.04 | 1.23 ± 0.05 | 1.21 ± 0.04 | 1.16 ± 0,04 | 1.18 ± 0.04 | 1.16 ± 0.04 | 1.14 ± 0.04 |
| (b) Agglomerates | |||||||
|---|---|---|---|---|---|---|---|
| Protocol | P1 | P2 | P3 | P4 | P5 | P6, rep 1 | P6, rep 2 |
| Fmin (nm) | 102 | 263 | 224 | 110 | 149 | 113 | 96 |
| Fmax (nm) | 130 | 371 | 327 | 151 | 225 | 164 | 127 |
| AR | 1.15 | 1.39 | 1.35 | 1.21 | 1.30 | 1.24 | 1.16 |