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Determination of NO2 − in water samples using AuNPs-rGO composite by UV-vis spectrophotometry. RSD is relative to five measurements.
| Sample | Detected (µM) | Added (µM) | Found (µM) | Recovery (%) | RSD (%) |
|---|---|---|---|---|---|
| Water sample 1 | Not detectable | 5.0 | 4.92 | 98.4 | 4.7 |
| Water sample 2 | 5.0 | 4.89 | 97.8 | 4.9 | |
| Water sample 3 | 5.0 | 4.86 | 97.2 | 5.2 | |
| Water sample 4 | 5.0 | 4.76 | 95.2 | 5.1 | |
| Water sample 5 | 5.0 | 4.79 | 95.8 | 4.4 | |
| Water sample 6 | 5.0 | 4.82 | 96.4 | 4.7 | |
| Water sample 7 | 5.0 | 4.91 | 98.2 | 6.0 |
