Figure 5: The effects of CH₃I and Hg²⁺ on the increased steady-state concentration of CH₃Hg⁺.

The obtained photomethylation rate constant of Hg²⁺ by CH₃I (k_M=1.51 × 10⁻² l mol⁻¹ E⁻¹ m²) and photodemethylation rate constant of CH₃Hg⁺ (k_D=0.015 m² E⁻¹) in the pond water were used to calculate the increased steady-state concentration of CH₃Hg⁺ (equation (17)). The concentrations of Hg²⁺ and CH₃I are assumed to be in the range of 0–5 nmol l⁻¹ and 0–7 mmol l⁻¹, respectively.