ISOTHERM_REACTIONS Card

Specifies parameters for a sorption reaction defined by an isotherm (e.g. linear, Langmuir, Freundlich)

Required Cards

ISOTHERM_REACTIONS : Opens the block

<Species_Name> : Name of primary species that sorbs

DISTRIBUTION_COEFFICIENT <float> : The value of K_D [kg_water / m^3^ bulk]. For K_D values provided in e.g. mL / g, convert to kg_w / m^3^ bulk by multiplying by \rho_w and \rho_b with proper units conversion.

Optional Cards

TYPE <string> : Type of isotherm

• LINEAR : Linear isotherm (K_D) -- C_sorb = K_D C_aq

• LANGMUIR : Langmuir isotherm -- C_sorb = K C_aq b / ( 1 + K C_aq )

• FREUNDLICH : Freundlich isotherm -- C_sorb = K_D C_aq^1/n^

LANGMUIR_B <float> : b coefficient for Langmuir isotherm. Automatically sets the type to LANGMUIR.

FREUNDLICH_N <float> : n exponent in Freundlich isotherm. Automatically sets the type to FREUNDLICH

Examples

ISOTHERM_REACTIONS
  Tracer
    DISTRIBUTION_COEFFICIENT 0.25d3  
  /
  Tracer2
    DISTRIBUTION_COEFFICIENT 0.5d3
    FREUNDLICH_N 1.67  ! 1/n = 0.6
  /
  Tracer3
    DISTRIBUTION_COEFFICIENT 0.5d3
    LANGMUIR_B 0.6 
  /
END