Problem in ionic strength effects

lonic-Strength Effects
9.36. The rate constant k for the reaction between persulfate ions and iodide ions varies with ionic strength I as follows:
I/10-3 mol dm³
2.45
3.65
4.45
6.45
8.45
12.45
1.39
k/dm³ mol¹s¹
1.05
1.12
1.16
1.18
1.26
Estimate the value of ZAZB.