Model equation

c₀₀

c₁₀

c₀₁

c₁₁

c₀₂

c₁₂

c₀₃

c₁₃

R²

c₀₀ + c₁₀I + c₀₁pH + c₁₁IpH + c₀₂pH²

−0.01392

8.116E−05

0.007423

2.846E−06

−5.604E−04

0.8943

c₀₀ + c₁₀I + c₀₁pH + c₁₁IpH + c₀₂pH² + c₁₂IpH²

−0.009616

−4.796E−05

0.005811

5.118E−05

−4.428E−04

−3.528E−06

0.9057

c₀₀ + c₁₀I + c₀₁pH + c₁₁IpH + c₀₂pH² + c₁₂IpH² + c₀₃pH³

−0.02801

−4.796E−05

0.01637

5.118E−05

−0.002168

−3.528E−06

8.393E−05

0.9934

c₀₀ + c₁₀I + c₀₁pH + c₁₁IpH + c₀₂pH² + c₁₂IpH² + c₀₃pH² + c₁₃IpH²

−0.02819

−4.257E−05

0.01648

4.808E−05

−0.002184

−3.023E−06

8.475E−05

−2.459E−08

0.9934