Table 2.
Nickel content (ppm) after the different experimental time intervals.
| Nickel release (PPM) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 7 days | 14 days | 21 days | Total | ||||||||
| GN | 0.00 | a | A | 0.00 | a | A | 0.00 | a | A | 0.0 (0.0) | A |
| GE | 0.14 ± 0.28 | a | ABC | 0.92 ± 0.03 | b | B | 0.68 ± 0.02 | b | B | 1.74 ± 0.27 | B |
| VE | 0.53 ± 0.03 | a | B | 0.00 ± 0.01 | b | A | 0.00 ± 0.01 | b | A | 0.54 ± 0.03 | C |
| SCs | 0.11 ± 0.03 | a | C | 0.07 ± 0.01 | b | C | 0.00 | c | A | 0.18 ± 0.01 | D |
| INs | 0.14 ± 0.01 | a | C | 0.39 ± 0.02 | b | D | 0.00 ± 0.01 | c | A | 0.54 ± 0.03 | C |
| ECs | 2.79 ± 0.03 | a | D | 1.24 ± 0.03 | b | E | 0.00 ± 0.01 | c | A | 4.03 ± 0.03 | E |
Identical letters reveal no statistical difference (p > 0.05). Intragroup significance - Comparison of the different time intervals in each group with ANOVA test and Tukey post hoc-test. Intergroup Significance - Comparison among the groups in each time interval with Kruskal-Wallis test and Wilcoxon post hoc-test.