User:Elaine Marie Robbins/Notebook/CHEM-496/2012/02/07

Effects of pH on AuNP

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Objective To determine the effect of Tris buffers of different pH on a AuNP solution. Description Take UV-vis data of 70 Au/BSA ratio solution prepared on 01/31/12. Take UV-vis data of 0.9 mL of each AuNP solution + 0.1 mL of the following pH values of 50 mM Tris: pH 7.5 pH 10.1 pH 11.85 Data Graph of absorbance vs wavelength: There appears to be a small shift toward UV and slightly increased absorbance with high pH values. Notes The pH meter used to determine the pH values of 50 mM tris solutions was having difficulty being calibrated.