Table 2: Validation results for repeatability and within-lab reproducibility for total-Ti and particle-TiO2 in human tissue. Repeatability and intermediate precision are expressed as relative standard deviations.

Parameter Concentration level sr (%) sRL (%)
Total-Ti as in sample 24 31
Particle diameter as in sample 29 24
Particle number concentration as in sample 20 46
Particle mass concentration as in sample 22 39