RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Gibbsite
Reference: WTWB04
SCM Type: CDM - (CD-)MUSIC
Ligand: AsO4<3-> - arsenate
Site Type: »Al-singly
Equation: 2 »Al-singly<0.5+> + AsO4<3-> + H<1+>  ⇔  (»Al-singly)2-As(OH)2
LogK: 17.952        LogK°I=0 (Conversion to I = 0):   18.28         LogK2.31 nm−2 (SSD-normalized):   19.22
Experiment: Sorption Isotherms
Ionic Strength: 0.005 mol/L NaNO3
Temperature: 298.0 K
Solid/Liquid Ratio: 20.0 g/L
pH Range: 4-10
Ligand Concentration Range: 0.66-16E-6 mol/L
Fit Method: ECOSAT
Comment: logK for Protolysis reaktion and background electrolyte complexation from [WDA00], site-type not clearly defined, assumed to be singly, R^2 = 0.992, residual mean of sum of squares = 1.257E-10, given sorption reaction: (>AlOH2<+1/2>)2 + HAsO4<2-> = (>AlO)2-AsO3, given mass action law: logK(As(V)) = [(>AlO)2As(OH)2]/[>AlOH<-/2>] * [HAsO4<2->]; acid dissociation constant pK3 = -12.52 for H3AsO4 [WGD92]
 
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