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Carbonate Adsorption Mechanism on Goethite Studied with ATR–FTIR, DRIFT, and Proton Coadsorption Measurements

^a The Connecticut Agricultural Experiment Station, P.O. Box 1106, New Haven, CT 06504
^b Dept. of Plant Science, U-67, University of Connecticut, Storrs, CT 06269

View larger version (22K): [in a new window]   Fig. 1. ATR–FTIR spectra of goethite with adsorbed carbonate. Spectra A and B were collected in 1 mM NaHCO3 solutions in H2O, spectra C and D were collected in 1 mM NaDCO3 solutions in D2O

View larger version (29K): [in a new window]   Fig. 2. DRIFT spectrum of goethite with adsorbed carbonate. Initial [NaHCO3] = 0.010 M and pH = 6.5. The intensity of the band at 1309 cm-1 is 0.083 absorption units (au)