Sample | Initially present (g∙mL−1) | Added (g∙mL−1) | Found (g∙mL−1) | Recovery (%) |
1 | 0.99 × 10−8 | 2.0 × 10−8 3.0 × 10−8 | 2.93 × 10−8 3.96 × 10−8 | 98.0 99.2 |
2 | 1.46 × 10−8 | 1.0 × 10−8 3.0 × 10−8 | 2.42 × 10−8 4.48 × 10−8 | 98.4 100.4 |
3 | 2.03 × 10−8 | 2.0 × 10−8 3.0 × 10−8 | 4.07 × 10−8 4.97 × 10−8 | 101.0 98.8 |
4 | 2.49 × 10−8 | 1.0 × 10−8 2.0 × 10−8 | 3.46 × 10−8 4.55 × 10−8 | 99.1 101.3 |
5 | 3.03 × 10−8 | 1.0 × 10−8 2.0 × 10−8 | 4.11 × 10−8 4.93 × 10−8 | 102.0 98.0 |