Table 6. Application of the Proposed Method for Pb Determination in Spiked Water Samples.
| sample | proposed method (μg L–1) | added (μg L–1) | found (μg L–1) | an error of measurement (μg L–1) | an error of measurement (%) | precision (sd)a (μg L–1) | precision (RSD%)b | MUc | accuracy (recovery) (%) |
|---|---|---|---|---|---|---|---|---|---|
| drinking water 1 | <LOD | 1.5 | 1.554 | 0.054 | 4 | 0.031 | 1.98 | 2.29 | 104 |
| drinking water 2 | <LOD | 1.5 | 1.538 | 0.038 | 3 | 0.040 | 2.58 | 2.98 | 103 |
| drinking water 3 | <LOD | 2.0 | 2.096 | 0.096 | 5 | 0.069 | 3.29 | 3.79 | 105 |
| drinking water 4 | <LOD | 2.0 | 2.075 | 0.075 | 4 | 0.080 | 3.84 | 4.43 | 104 |
a
standard deviation.
b
relative standard deviation.
c
MU: measurement uncertainty, k = 2, 95% confidence level.