Potassium sorbate concentration (wt%)

Film thickness (mm)

D (×10−12 m2/s)

n

0.2

0.072 ± 0.003

1.96

0.471

0.5

0.065 ± 0.001

2.87

0.440

1.0

0.068 ± 0.001

6.20

0.520