EPA On-line Tools for Site Assessment Calculation

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Retardation Factor Calculator

Retardation Factor R = 1 + r_bk_d /q

R = retardation factor
r_b = bulk density = r_s(1-q)
r_s = solids density
q = porosity
k_d = (soil) distribution coefficient = f_oc K_oc
f_oc = fraction organic carbon
K_oc = organic carbon/water partition coefficient

Input Parameters


Site Name
Date
Porosity (q )		(Try 0.25)
Fraction Organic Carbon (f_oc)		(Try 0.0001)
Chemical Data Source
Note:
Data revision date
Chemical

Default Parameters


Solids Density (r_s)		Default
K_oc value		L/kg

Results


Bulk Density (r_b)		g/cm³
k_d		L/kg
Retardation Factor (R)

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Contact Jim Weaver to ask a technical question on this material.