Table 5 Determination of copper in water samples
Sample | Added, μg L−1 | Found, μg L−1 | RSD (%), n = 3 | Recovery (%) |
|---|---|---|---|---|
Tap water (1) | – | < LOD | ||
10.0 | 9.6 | 3.3 | 96 | |
20.0 | 19.0 | 2.6 | 95 | |
50.0 | 50.3 | 1.2 | 101 | |
Tap water (2) | – | < LOD | ||
10.0 | 10.2 | 5.0 | 102 | |
20.0 | 19.5 | 1.1 | 97 | |
50.0 | 50.3 | 1.2 | 101 | |
Spring water | < LOD | |||
10.0 | 9.6 | 3.7 | 96 | |
20.0 | 19.2 | 2.7 | 96 | |
50.0 | 50.0 | 2.6 | 100 |