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. 2016 Mar 31;4:13. doi: 10.3389/fchem.2016.00013

Figure 1.

Figure 1

pH-dependent speciation of HAuCl4. The electronic absorption spectra of the different species of gold salt were obtained with 0.45 mM HAuCl4 solutions in the presence sodium 26 mM of sodium phosphate, at the pH range of 3–12.