Contaminant Impacts on the Soil–Subsurface Solid Phase - Contaminant Geochemistry - page 518

Fig. 18.19 Normalized uptake and release rates of bulk and tracer 1,4-dichlorobenzene (DCB)
on Beulah-Zap (BZL) lignite during a sorption of bulk (SKB), b desorption of bulk (DKB),
c forward isotope exchange at the sorption point (FIES), d reverse isotope exchange at the
sorption point (RIES), and e reverse isotope exchange at the desorption point (RIED). M is the
cumulative mass of DCB taken up or released, and M f is the final mass taken up or released by the
geosorbent. C Eq is the final leveling-off concentration during SKB and DKB and the constant bulk
concentration during isotope exchange steps. Reprinted from Sander and Pignatello ( 2009 ).
Copyright 2009 with permission of John Wiley and Sons
effect. Based on these observations, Sander and Pignatello ( 2009 ) conclude that
uptake and release of bulk DCB at the higher concentration are coupled to matrix
exchange in peat and lignite.