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R2 values for correlations of concentrations for various combinations of grinding size (coarse and fine) and Pb test (total and 1 M HNO3).
| Pb Tests | R2 | |
|---|---|---|
| Total, coarse grind | 1 M HNO3, coarse grind | 0.337 |
| Total, fine grind | 1 M HNO3,fine grind | 0.917 |
| 1 M HNO3,fine grind | 1 M HNO3,coarse grind | 0.881 |
| Total, fine grind | 1 M HNO3,coarse grind | 0.749 |
