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Calibration graph absorbance against the concentration of heavy metals in mg/L.
| S.No. | Metal | Model for Absorbance vs. concentration | R2 |
|---|---|---|---|
| 1 | Zn | y = 0.3328x | 0.9960 |
| 2 | Cu | y = 0.0804x | 0.9972 |
| 3 | Mn | y = 0.0883x | 0.9983 |
| 4 | Cd | y = 0.1291x | 0.9953 |
| 5 | Cr | y = 0.0402x | 0.9981 |
| 6 | Pb | y = 0.0059x | 0.9972 |
| 7 | Ni | y = 0.0273x | 0.9965 |
| 8 | Co | y = 0.0198x | 0.9976 |
| 9 | Fe | y = 0.0163x | 0.9986 |
