Research Article
A Derivative Spectrometric Method for Hydroquinone Determination in the Presence of Kojic Acid, Glycolic Acid, and Ascorbic Acid
Figure 3
UV spectra of (1) 2 × 10−4 mol·L−1 HQ in the presence of 2 × 10−4 mol·L−1 K2Cr2O7 (in excess), in 1 mol·L−1 sulfuric acid; (2) K2Cr2O7 at a level of concentration corresponding to those unreacted in solution (1); .