Figure 5

ATR-FTIR absorbance spectra (above curve in each panel) of oxalate adsorbed onto ferrihydrite for the paste samples collected at 72 h and the corresponding second-derivative ATR-FTIR spectra (lower curve in each panel).
ATR-FTIR absorbance spectra (above curve in each panel) of oxalate adsorbed onto ferrihydrite for the paste samples collected at 72 h and the corresponding second-derivative ATR-FTIR spectra (lower curve in each panel).