Fig. 8. Normalized Cu extended X-ray absorption fine structure (EXAFS) k2–weighted chi (left panel) and corresponding Fourier transforms (right panel) of the Cu-contaminated soil treated by electrokinetic remediation (EKR) for (a) 0, (b) 60, (c) 120, and (d) 180 min. Dotted and solid lines denote the fitting and experimental data, respectively.