Aging period | |||||||||
Samples | S0 | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
Wwp CW | ND ND | ND 1 × 10 | ND ND | 2 × 10 ND | ND 1 × 10 | 1 × 10 ND | ND ND | ND ND | ND ND |