Table 5 Reproducibility precision studies data for determination of Pb, Cd and Cr
Analyte | Day | Spiked concentration (μg/g) | Mean concentration (μg/g) | RSD (%) | Overall mean concentration (μg/g) | Overall RSD (%) |
|---|---|---|---|---|---|---|
Pb | 1 | 2.50 | 2.26 | 7.40 | 2.46 | 9.11 |
2 | 2.50 | 2.55 | 7.35 | |||
3 | 2.50 | 2.59 | 6.78 | |||
1 | 5.00 | 4.88 | 9.65 | 5.10 | 8.47 | |
2 | 5.00 | 5.16 | 3.23 | |||
3 | 5.00 | 5.27 | 1.26 | |||
1 | 7.50 | 6.99 | 7.73 | 7.26 | 8.84 | |
2 | 7.50 | 6.83 | 3.03 | |||
3 | 7.50 | 8.11 | 9.05 | |||
Cd | 1 | 0.50 | 0.52 | 7.51 | 0.51 | 7.25 |
2 | 0.50 | 0.51 | 9.23 | |||
3 | 0.50 | 0.51 | 5.51 | |||
1 | 1.00 | 1.04 | 9.31 | 1.02 | 7.76 | |
2 | 1.00 | 0.97 | 6.12 | |||
3 | 1.00 | 1.06 | 3.05 | |||
1 | 1.50 | 1.57 | 8.23 | 1.54 | 6.69 | |
2 | 1.50 | 1.60 | 2.72 | |||
3 | 1.50 | 1.46 | 6.34 | |||
Cr | 1 | 2.50 | 2.28 | 9.63 | 2.32 | 6.79 |
2 | 2.50 | 2.35 | 4.71 | |||
3 | 2.50 | 2.34 | 3.94 | |||
1 | 5.00 | 4.25 | 6.18 | 4.69 | 8.13 | |
2 | 5.00 | 4.84 | 4.64 | |||
3 | 5.00 | 4.99 | 1.97 | |||
1 | 7.50 | 6.07 | 5.18 | 6.99 | 9.04 | |
2 | 7.50 | 7.52 | 0.75 | |||
3 | 7.50 | 7.39 | 1.99 |