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| Coexisting substance | Content (mol L−1) | ΔIa/I (%) |
|---|---|---|
| Na+ | 5 × 10−3 | 1.25 |
| K+ | 5 × 10−3 | −1.96 |
| NH4+ | 5 × 10−3 | −1.26 |
| SO42− | 2 × 10−3 | −2.80 |
| Mn2+ | 2 × 10−3 | 2.90 |
| Cl− | 2 × 10−3 | 2.38 |
| CO32− | 2 × 10−3 | −7.50 |
| Glucose | 2 × 10−3 | −2.47 |
| Citric acid | 2 × 10−3 | 1.77 |
ΔI = I0 − I, where I0 and I are the fluorescence intensities of the BA–Na10[α-SiW9O34]–H2O2 system in the absence and presence of interfering species.
