Figure 9

Ni K-edge X-ray absorption near edge spectra (XANES) for (A) 1:10 Ni:citrate in buffered pH 5.5 aqueous solution; (B) Glochidion cf. sericeum leaf sample 1; (C) Phyllanthus balgooyi leaf tissue (from33); (D) Glochidion cf. sericeum leaf tissue sample 2 (green trace), 1:1 Ni:citrate in buffered pH 5.5 aqueous solution (black trace). Vertical lines are drawn at 8361 and 8400 eV to aid visual comparison of key features in the spectra.