Retardation Calculator (calculate retardation factor)

p_b (dry bulk density):   
2.65 g/cm^3 can be assumed for most mineral soils (Freeze & Cherry).

è (porosity):  1) Porosity calculator 
2) Table of standard values (Freeze & Cherry)

K_d (distribution coefficient): 

Retardation Coefficient:   

 

Dry Bulk Density Calculator

Dry mass of soil particles:   
Volume of Sample: 

Dry Bulk Density:   


Example Calculation

The following is an example calculation for the retardation coefficient.

Given: K_d = 3 mL/g (newsletter Vol. 8 No. 5 will cover details about the distribution coefficient)

         p_b = 1.75 g/cm³

            è = 0.20

Calculation:

R = [1 + (p_b/è)(K_d)]

R = [1 + {((1.75 g/cm³)/0.20)(3 mL/g)(1cm³/1mL)}]

R = [1 + 26.25]

R = 27.25