Table 2 Determination of chromium (VI) species using proposed and standard AAS methods
Sample | Amount of Cr (VI) added (ng) | Experimental values for Cr (VI) (ng) (n = 3) | ||
|---|---|---|---|---|
Photometric | Fluorometric | AAS | ||
Tap water | 180.0 | 179.4 ± 0.05 | 179.6 ± 0.08 | 179.5 ± 0.07 |
Rain water | 140.0 | 166.8 ± 0.08 | 166.5 ± 0.04 | 163.7 ± 0.05 |
Drainage water | 120.0 | 138.4 ± 0.04 | 138.8 ± 0.05 | 138.5 ± 0.07 |