| 样品 | 原样测定值(mg/L) | 加标量(mg/L) | 加标后测定(mg/L) | 回收率(%) |
| 1 | 0.0000 | 0.005 | 0.0054 | 108.0 |
| 2 | 0.0025 | 0.0100 | 0.0115 | 90.0 |
| 3 | 0.0031 | 0.0100 | 0.0125 | 94.0 |
| 4 | 0.0000 | 0.0300 | 0.0290 | 96.7 |
| 5 | 0.0000 | 0.0100 | 0.0095 | 95.0 |
| 6 | 0.050 | 0.0200 | 0.0708 | 104.0 |