The tolerance ratio (TR = ion/Se4+ mass ratio) for various interfering ions in the determination of 100 ng mL−1 of Se4+.
| Ion | TR | Ion | TR |
|---|---|---|---|
| Na+, K+, Li+ | 12 500 | Al3+, Fe3+, CO32− | 4000 |
| Ca2+, Mg2+, acetate | 11 000 | Fe2+, NH2OH | 3500 |
| Ag+, Cu2+, NO3− | 1000 | Cd2+, Ni2+, SO42− | 3000 |
| Sr2+, Ba2+, S2O32− | 8500 | Hg2+, Co2+, oxalate | 2750 |
| Ge4+, Ti4+, citrate | 7000 | Cu2+, Sn2+, HCO32− | 2500 |
| Bi2+, Sn2+, Mn2+ | 6000 | Pb2+, Pd2+, SCN− | 2000 |
| Zr4+, Cr6+, succinate | 5500 | Au3+, La3+, Cr3+ | 1750 |
| Mo6+, W6+, Br− | 5000 | Se6+, Te6+, NH4+ | 1500 |
| Th4+, UO22+, B4O72− | 4500 | Te4+ | 120 |