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| Sample | Added F− (μM) | Detected (μM) | Recovery (%) | RSD (%) |
|---|---|---|---|---|
| Tap water | 0 | Not detected | — | — |
| 5 | 5.11 | 102.33 | 1.97 | |
| Qinghe River | 0 | Not detected | — | — |
| 5 | 5.16 | 103.33 | 2.03 | |
| Weiming Lake | 0 | Not detected | — | — |
| 5 | 5.12 | 102.40 | 1.86 | |
| Industrial wastewater (A) | 0 | Not detected | — | — |
| 5 | 5.15 | 103.07 | 1.29 | |
| Industrial wastewater (B) | 0 | Not detected | — | — |
| 5 | 5.22 | 104.47 | 1.74 |
