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| Coexisting substance | Tolerance (times) | Relative error (%) |
|---|---|---|
| Zn2+ | 50 | −5.6 |
| Mn2+ | 10 | −7.5 |
| Ba2+ | 50 | 2.8 |
| Ca2+ | 10 | 4.8 |
| Al3+ | 10 | 3.5 |
| Pb2+ | 10 | 4.8 |
| Cr6+ | 50 | −7.3 |
| Ethanediol | 50 | 6.0 |
| NH4Cl | 10 | −0.4 |
| NO2− | 10 | −5.3 |
| Mg2+ | 10 | 2.2 |
| Cu2+ | 50 | 0.4 |
| K+ | 10 | 6.3 |
| Fe3+ | 50 | −7.0 |
| Bi3+ | 50 | 8.9 |
| SO42− | 50 | −7.0 |
| Ethyl alcohol | 100 | 0.6 |
| Glycine | 50 | 0.7 |
| Co2+ | 10 | 3.4 |
| Hexamethylenetetramine | 50 | −7.0 |
| Hydrazine hydrochloride | 100 | 3.0 |
| Edetate disodium | 50 | −4.2 |
| Creatine | 50 | 1.3 |
