Table 1.
Precision and accuracy determinations of spiked samples with ChCl.
| Replicate | 1 |
2 |
3 |
4 |
5 |
6 |
Mean ± SD |
%RSD |
|---|---|---|---|---|---|---|---|---|
| Concentration, mg kg−1 (Recovery, %) | ||||||||
| Spike level, 1 mg kg−1 | ||||||||
| Intraday | 1.03 (91.5) | 0.97 (86.2) | 0.91 (80.9) | 1.12 (99.5) | 1.11 (98.7) | 0.98 (87.1) | 1.02 ± 0.08 (90.7 ± 6.7) | 7.4 |
| Interday | 1.11 (98.7) | 0.95 (84.4) | 0.98 (87.1) | 1.21 (107.5) | 1.26 (112.0) | 1.19 (105.8) | 1.12 ± 0.12 (99.3 ± 10.3) | 10.4 |
| Spike level, 1000 mg kg−1 | ||||||||
| Intraday | 998.1 (100.1) | 1 000.3 (100.3) | 1 122.1 (112.5) | 995.6 (99.8) | 990.7 (99.3) | 1 000.9 (100.4) | 1 018.0 ± 46.7 (102.1 ± 4.7) | 4.6 |
| Interday | 1 011.12 (101.3) | 1 109.1 (111.1) | 1 134.5 (113.6) | 1 000.8 (100.4) | 998.7 (100.0) | 996.1 (99.8) | 1 041.9 ± 57.2 (104.4 ± 5.7) | 5.5 |
SD: standard deviation.% RSD: percentage relative standard deviation. Spike samples were prepared adding the necessary solid standard to a blank sample, real concentrations of 1.12 and 997.25 mg kg−1 calculated for the nominal spike levels of 1 and 1000 mg kg−1, respectively.