Table 4 Determination of iron (III) amount of real samples using standard addition technique
Sample | Amount added (ppm) | Concentration of Fe3+ ions (ppm) | Recovery (%) | |
|---|---|---|---|---|
ISE methoda | AAS methoda | |||
Drinking tap water | – | < Limit of detection | < Limit of detection | N/A |
5.00 | 5.21 ± 0.32 | 5.08 ± 0.11 | 102.5 | |
10.00 | 10.03 ± 0.19 | 10.13 ± 0.15 | 99.0 | |
15.00 | 15.32 ± 0.41 | 15.25 ± 0.42 | 100.4 | |
25.00 | 25.39 ± 0.24 | 25.10 ± 0.28 | 101.1 | |
40.00 | 39.85 ± 0.36 | 40.37 ± 0.17 | 98.7 | |
Treated hospital waste water | – | 14.11 ± 0.21 | 13.73 ± 0.21 | 102.7 |
10.00 | 23.85 ± 0.34 | 23.52 ± 0.32 | 101.4 | |
20.00 | 33.21 ± 0.19 | 33.84 ± 0.22 | 98.1 | |
30.00 | 43.79 ± 0.35 | 43.44 ± 0.36 | 100.8 | |