Fig. 9 Diffuse reflectance infrared Fourier transform (DRIFT) difference spectra of sorbed selenate on am-Fe(OH)₃ reacted at pH 5.0 with (a) 0.10 M Na₂SeO₄ + 1.0 M NaCl, and (b) 0.05 M Na₂SeO₄ + 1.0 M NaCl. The reference spectrum for (a) and (b) was the am-Fe(OH)₃ equilibrated with 1.0 M NaCl. The solid to KBr ratio was 5 to 95 mg. Regent grade Na₂SeO₄ (c) was included for comparison. The BET N₂ surface area of am-Fe(OH)₃ was 250 m² g^-1

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