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Determination of 4-NP in water samples (n = 4).
| Type of Water a | Added (μM) | Found by This Method b (μM) | Recovery (%) | Found by HPLC b (μM) | Relative Error (%) |
|---|---|---|---|---|---|
| River | 0.5 | 0.512 (±0.015) | 102.4 | 0.483 (±0.012) | 6.00 |
| Lake | 1.0 | 0.976 (±0.018) | 97.6 | 1.024 (±0.022) | −4.69 |
| Waste | 2.0 | 2.071 (±0.033) | 103.6 | 1.962 (±0.042) | 5.56 |
| Tap | 0.1 | 0.102 (±0.002) | 102.0 | 0.106 (±0.003) | −3.77 |
a All water samples were collected from Hengyang, China. b average ± confidence interval, the confidence level is 95%.
