% Acidity Mean (SD) | ||||
Months | Glass | PET | HDPE | PLA |
0 | 0.1 (0.01) | 0.1 (0.01) | 0.1 (0.01)a* | 0.1 (0.01) |
3 | 0.10 (0.01) | 0.11 (0.01) | 0.10 (0.01)** | 0.10 (0.01) |
5 | 0.10 (0.01) | 0.11 (0.31) | 0.12 (0.01)*** | 0.12 (0.02) |
7 | 0.11 (0.10)a | 0.12 (0.01) | 0.15 (0.01)a,*,** | 0.13 (0.01) |
9 | 0.12 (0.01)b | 0.13 (0.01)c | 0.23 (0.25)b,c,d,*,**,*** | 0.12 (0.01)d |