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Table 5 Determination of copper in water samples

From: Determination of copper(II) by flame atomic absorption spectrometry after its perconcentration by a highly selective and environmentally friendly dispersive liquid–liquid microextraction technique

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