Table 1 Tolerant limits of coexisting ions for the extraction of 0.5 μg mL−1 silver ions
Interference ion | Added as | Tolerance limit ion ratio (Cion/CAg) | % Recovery |
|---|---|---|---|
Mg2+ | Mg(NO3)2 | 1000 | 96 ± 3 |
K+ | KNO3 | 100 | 95.1 ± 2.2 |
Ca2+ | Ca(NO3)2.4H2O | 10 | 95.4 ± 2.5 |
Co2+ | Co(NO3)2.6H2O | 10 | 97.1 ± 3.4 |
Cd2+ | Cd(NO3)2.6H2O | 10 | 96.0 ± 1.5 |
Hg+ | Hg2(NO3)2 | 5 | 95.4 ± 2.3 |
Al3+ | Al(NO3)3 | 5 | 97.32 ± 2.4 |
Na+ | NaNO3 | 5 | 96.3 ± 3.3 |
Mn2+ | Mn(NO3)2.4H2O | 5a | 95.0 ± 2.3 |
Pb2+ | Pb(NO3)2 | 1 | 94.0 ± 3.5 |
Hg2+ | Hg(NO3)2 | 1a | 98.8 ± 1.4 |
Ni2+ | Ni(NO3)2 | 5a | 95.35 ± 2.5 |
Fe3+ | Fe(NO3)3.9H2O | 1b | 95.76 ± 3.4 |
NO3 − | KNO3 | 100 | 95.2 ± 3.5 |
CO3 2− | K2CO3 | 100 | 95.0 ± 4.3 |
OAC− | CH3COOK | 25 | 100.4 ± 1.3 |
Cl− | KCl | 10 | 95.06 ± 3.2 |