Heavy metals | Wavelength (nm) | Calibration curve | Determination coefficient (R2) | Regression coefficient (r) | Detection limit (mg/L) |
Cd | 228.8 nm | y = 0.3497x − 0.0019 | 0.999 | 0.999 | 0.03 |
Cu | 324.8 nm | y = 0.1179x − 0.0015 | 0.999 | 0.999 | 0.03 |
Ni | 232.0 nm | y = 0.0880x − 0.0011 | 0.996 | 0.997 | 0.05 |
Pb | 217.0 nm | y = 0.0484x − 0.0008 | 0.999 | 0.999 | 0.03 |
Zn | 213.9 nm | y = 0.3917x + 0.0377 | 0.996 | 0.997 | 0.50 |