Table 1. Relative Standard Deviations Calculated for Different Series of Three Measurements Comparing the Factors That Influence the Chemical Composition Variations (PIGE).
| Na2O | MgO | Al2O3 | SiO2 | P2O5 | K2O | CaO | |
|---|---|---|---|---|---|---|---|
| Repeatabilitya | |||||||
| Brill D | 2.1% | 1.3% | 1.0% | 0.2% | 1.3% | 0.5% | 0.8% |
| Sample Heterogeneity | |||||||
| punctual | 5% | 1% | 1% | 1% | 1% | 1% | 1% |
| mapping | 4% | 3% | 2% | 1% | 1% | 2% | 2% |
| Workshop Variationb | |||||||
| four colors | 14% | 4% | 6% | 1% | 3% | 4% | 7% |
a
Estimated from the reference material glass Brill D.33
b
After renormalization of the composition including only the major oxides.