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. 2017 Feb 16;7:41861. doi: 10.1038/srep41861

Figure 6.

Figure 6

Ni K-edge X-ray absorption near edge spectra for A P. balgooyi phloem tissue (black trace) and 1:1 Ni:citrate in aqueous solution (green trace); B Ni:nitrate in aqueous solution (i.e. [Ni(H2O)6]2+-black trace) and 1:10 Ni:citrate in aqueous solution (green trace); C, 1:6 Ni:glutathione in aqueous solution at pH ~5–6 (black trace), 1:6 Ni:acetate in aqueous solution at pH ~5–6 (green trace), 1:6 Ni:aconitate in aqueous solution at pH ~5–6 (red trace), 1:6 Ni:succinate in aqueous solution at pH ~5–6 (blue trace)–all traces essentially identical; D 1:6 Ni:tartrate in aqueous solution at pH ~5–6 (black trace), 1:6 Ni:malate in aqueous solution at pH ~5–6 (green trace); E 1:6 Ni:acetylacetone in aqueous solution at pH ~5–6 (black trace), 1:6 Ni:malonate in aqueous solution at pH ~5–6 (green trace); F 1:6 Ni:nicotianamine in aqueous solution at pH ~5–6 (black trace), 1:6 Ni:oxalate in aqueous solution at pH ~5–6 (green trace), 1:6 Ni:phytate in aqueous solution at pH ~5–6 (red trace); G NiO(s) (black trace) and Ni(OH)2(s) (green trace) diluted to 1000 ppm in boron nitride; H 1:6 Ni:cysteine in aqueous solution at pH ~8 (black trace), 1:6 Ni:glutathione in aqueous solution at pH ~8 (blue trace), 1:6 Ni:histidine in aqueous solution at pH ~8 (red trace). Vertical lines are drawn at 8361 and 8400 eV to aid visual comparison of key features in the spectra. The spectra are shifted vertically for clarity.