The application of the proposed method to microwave digested food samples for the determination of selenium.
| Samples | Selenium (μg kg−1)a ± SD | t-testb | F-valuec | |
|---|---|---|---|---|
| Sensor | ETAAS | |||
| Canned tomato | 187 ± 0.11 | 185 ± 1.07 | 1.27 | 2.63 |
| Potato | 99 ± 0.09 | 100 ± 0.84 | 1.53 | 2.96 |
| Coffee | 188 ± 0.16 | 185 ± 0.88 | 1.07 | 2.35 |
| Black tea | 284 ± 0.19 | 280 ± 1.32 | 1.33 | 2.75 |
| Green tea | 143 ± 0.11 | 145 ± 1.03 | 1.48 | 2.62 |
| Honey | 197 ± 0.18 | 200 ± 0.96 | 1.22 | 2.48 |
| Garlic | 344 ± 0.20 | 345 ± 1.24 | 1.36 | 2.84 |
| Egg | 167 ± 0.14 | 165 ± 1.13 | 1.74 | 3.17 |
| Salami | 160 ± 0.10 | 160 ± 0.79 | 1.11 | 2.39 |
| Onion | 273 ± 0.24 | 270 ± 0.92 | 1.29 | 2.67 |
| Cultivated mushroom | 215 ± 0.12 | 217 ± 0.69 | 1.45 | 2.72 |
| Canned fish | 430 ± 0.35 | 427 ± 0.85 | 1.67 | 2.98 |
| Cows meat | 226 ± 0.17 | 230 ± 1.17 | 1.41 | 2.56 |
| Boiled wheat | 135 ± 0.12 | 140 ± 0.95 | 1.63 | 3.04 |
| Cheese | 263 ± 0.22 | 260 ± 1.28 | 1.16 | 2.53 |
| Chicken meat | 158 ± 0.13 | 155 ± 1.05 | 1.44 | 2.69 |
a
Mean ± SD.
b
Theoretical values for t-test at 95% confidence level for five degrees of freedom is 2.57.
c
Theoretical values for F-value at 95% confidence level for five degrees of freedom is 5.05.