| Metal | Concentrations of working standards (mg/L) | Correlation coefficient of the calibration curves | Equation for calibration curve |
| Na | 0.25, 0.5, 0.75, 1, 1.25 | 0.9987 | A = 0.0684C − 0.0013 |
| K | 0.25, 0.5, 1, 1.5, 2 | 0.9990 | A = 0.0312C − 0.007 |
| Mg | 5, 10, 15, 20, 25 | 0.9992 | A = 0.0816C − 0.265 |
| Ca | 5, 10, 15, 20, 25 | 0.9981 | A = 0.0387C − 0.1187 |
| Mn | 0.25, 0.5, 0.75, 1, 1.25 | 0.9981 | A = 0.2768C − 0.0634 |
| Cu | 0.11, 0.25, 0.3, 0.35, 0.4 | 0.9992 | A = 0.0869C − 0.0025 |
| Zn | 0.1, 0.25, 0.5, 0.75, 1 | 0.9995 | A = 0.0893C − 0.001 |
| Fe | 0.5, 1, 2, 3, 4 | 0.9986 | A = 0.19C + 0.0897 |
| Pb | 0.15, 0.25, 0.35, 0.45, 0.55 | 0.9959 | A = 0.027C − 0.0031 |
| Cd | 0.15, 0.25, 0.45, 0.55, 0.95 | 0.9976 | A = 0.1588C − 0.0253 |