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. Author manuscript; available in PMC: 2020 Sep 1.

Published in final edited form as: Appl Geochem. 2019 Sep 1;108:1–16. doi: 10.1016/j.apgeochem.2019.104388

Table 7.

Complex forming constants of Cd (Parkhurst and Appelo, 1999).

Reaction	log K
Cd²⁺ + H₂O = CdOH⁺ + H⁺	−10.08
Cd²⁺ + 2 H₂O = Cd(OH)₂ + 2 H⁺	−20.35
Cd²⁺ +3 H₂O = Cd(OH)₃⁻ + 3 H⁺	−33.3
Cd²⁺ + 4 H₂O = Cd(OH)₄²⁻ + 4 H⁺	−47.35
Cd²⁺ + Cl⁻ = CdCl⁺	1.98
Cd²⁺ + 2 Cl⁻ = CdCl₂⁰	2.6
cd²⁺ + 3 cl⁻ = CdCl₃⁻	2.4
Cd²⁺ + CO3²⁻ = CdCO₃⁰	2.9
Cd²⁺ + 2CO₃²⁻ = Cd(CO₃)₂²⁻	6.4
Cd²⁺ + HCO3⁻ = CdHCO₃⁺	1.5
Cd²⁺ + SO4²⁻ = CdSO₄⁰	2.46
Cd²⁺ + 2SO₄²⁻ = Cd(SO₄)₂²⁻	3.5
Cd²⁺ + F⁻ = CdF⁺	1.1
Cd²⁺ + 2F⁻ = CdF₂⁰	1.5
2Cd²⁺ + H₂O = Cd₂OH³⁺ + H⁺	−9.39
Cd²⁺ + H₂O + Cl⁻ = CdOHCl⁰ + H⁺	−7.404
Cd²⁺ + NO₃⁻ = CdNO₃⁺	0.4
Cd²⁺ + HS⁻ = CdHS⁺	10.17
Cd²⁺ + 2HS⁻ = Cd(HS)₂⁰	16.53
Cd²⁺ + 3HS⁻ = Cd(HS)₃⁻	18.71
Cd²⁺ + 4HS⁻ = Cd(HS)₄²⁻	20.9