| 样品 | 本底值(μg/L) | 加标量(μg/L) | 测定值(μg/L) | 回收率(%) |
| 样品1 | 20.8 | 10.0 | 30.2 | 94.0 |
| 20.6 | 29.8 | 104.0 | ||
| 21.2 | 29.6 | 94.0 | ||
| 21.0 | 30.1 | 99.0 | ||
| 20.1 | 29.3 | 96.0 | ||
| 19.8 | 28.8 | 95.0 |