Effects of Nonaqueous Phase Liquids Pollution on the Permeability and Microstructure of In-Filed and Laboratory Soaked Contaminated Clay Soils

Table 2

The cation exchange capacity of uncontaminated saturated clay and contaminated with TCE saturated clay.

Soil layer	cation exchange capacity (cmol/kg)
	The field contaminated soil samples	Uncontaminated soil samples
Layer (2)	14.0	13.3
Layer (3)	12.1	11.3
Layer (4)	17.9	12.6
Layer (5)	12.9	10.0