Time (days)

C_t (mg/L)

C_t/C_o (mg/L)

lnC_t/C_o

4

38

0.8085

−0.21

8

30

0.6383

−0.45

12

25

0.5319

−0.63

16

15

0.3191

−1.14

20

7

0.1489

−1.90