pH = 7.4

Higuchi

VAN@HBG

VAN@5Mg-HBG

VAN@7.5Mg-HBG

VAN@10Mg-HBG

VAN@15Mg-HBG

K

24.85085

21.15365

22.7036

16.56719

16.0238

R²

0.89741

0.91857

0.93048

0.88041

0.95572

First order

K

−0.00037556

−0.00219

−0.00113

−0.000829882

−0.000137107

R²

0.10241

0.47871

0.88791

0.42735

0.21963

pH = 1.2

Higuchi

VAN@HBG

VAN@5Mg-HBG

VAN@7.5Mg-HBG

VAN@10Mg-HBG

VAN@15Mg-HBG

K

11.33105

10.87531

11.18698

9.98198

8.45964

R²

0.77065

0.84933

0.75581

0.90155

0.72384

First order

K

−0.00422

−0.00558

−0.00428

−0.00182

−0.00196

R²

0.91019

0.91397

0.89708

0.73153

0.87885