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Fourier transform infrared (FTIR) spectroscopy of the ferrihydrite. Synthetic (unmodified) ferrihydrite is shown in black, tryptophan in blue, sodium tartrate in green and the tartrate-modified ferrihydrite is in red. Unique tartrate but no tryptophan signatures are revealed in the modified material. Synthetic and tartrate-modified ferrihydrite were prepared as per Figure 2.
