Table 4.
Determination of Cd and Zn in certified samples (CRM) by microwave digestion method (MWD).
| Elements | Certified values | MWD | T valuea | % Recoveryb |
|---|---|---|---|---|
| CRM of whole serum (mg /1) | ||||
| Iron | 1.30 ± 0.3 | 1.286 ± 0.087 (7.65) | 0.824 | 98.9 |
| Copper | 1.2 ± 0.2 | 1.194 ± 0.074 (6.20) | 0.855 | 99.5 |
| Zinc | 0.97 ± 0.01 | 0.965 ± 0.019 (1.97) | 0.376 | 99.5 |
| CRM of whole blood (mg /1) | ||||
| Iron | 14.2 ± 3.24 | 14.15 ± 0.76 (5.37) | 0.935 | 99.6 |
| Copper e | 13.9 ± 2.7 | 13.85 ± 0.97 (7.00) | 0.910 | 99.6 |
| Zinc | 2.27 ± 0.06 | 2.24 ± 0.05 (2.23) | 0.304 | 98.7 |
| CRM of human hair (μg/ g) | ||||
| Iron | 580.0 ± 10 d | 576.0 ± 21.0 (3.64) | 0.657 | 99.3 |
| Copper | 110 ± 5 f | 109.5 ± 4.33 (3.95) | 0.838 | 99.5 |
| Zinc | 199 ± 5 | 198.5 ± 10.0 (5.04) | 0.872 | 99.7 |
cmg/l.
dInformative value.
eμg/l.
^Paired t-test between Certified Value and MWD DF = 5, T (critical) at 95 % CI = 2.57, p < 0.50 Values in () are %RSD $ % recovery was calculated according to : ([MDM])/([Certified Value]) x 100.
dInformative value.