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Coefficient of determination (r2) and average relative errors of back-calculated concentrations (%RE) for standard curves on different days.
| Day 1 | Day 2 | Day 3 | Mean r2 | |
|---|---|---|---|---|
| r2 | 0.987 | 0.992 | 0.979 | 0.986 |
| %RE | 7.49 | 4.44 | 3.76 | 5.23 |
%RE—Relative error of back-calculated concentrations. All samples were run in quadruplicate.
