No | Metal | Intermediate Standards (mg/L) | Working standards (mg/L) | Correlation coefficient of calibration curves |
---|---|---|---|---|
1 | Cu | 10 | 0.02,0.5,1,1.5,2,2.5,3 | R2 = 0.996 |
2 | Zn | 10 | 0.02,0.5,1,1.5,2,2.5,3 | R2 = 0.991 |
3 | Pb | 10 | 0.01,0.2,0.4,0.6.0.8.1 | R2 = 0.993 |
4 | Cd | 10 | 0.001,0.2,0.4,0.6,0.8,1 | R2 = 0.996 |
5 | Mn | 10 | 0.02,0.5,1,1.5,2,2.5,3 | R2 = 0.996 |
6 | Cr | 10 | 0.01,0.5,1,1.5,2,2.5,3 | R2 = 0.992 |