K-D IN SCREENING-LEVEL GROUNDWATER CONTAMINANT-TRANSPORT MODEL

This paper describes the use of system-specific and literature values for the distribution coefficient (K-d) in a screening-level ground-wat er contaminant-transport model. A comparison of observed contaminant t ransport (Cd2+) in a laboratory soil column with predicted contaminant transport using a computer model is described and discussed. The resu lts indicate that measured K-d values and K-d values taken from the li terature can provide useful approximations of the sorption of inorgani c ions in screening-level ground-water contaminant-transport models if experimental conditions (especially pH and electrolyte composition) a nd soil type are similar to those being modeled.