Research Article
A Derivative Spectrometric Method for Hydroquinone Determination in the Presence of Kojic Acid, Glycolic Acid, and Ascorbic Acid
Figure 5
Overlaid (a) zero-order and (b) first-order derivative spectra of HQ, KA, GA, and AA in the presence of K2Cr2O7 in 1 mol·L−1 sulfuric acid; every compound has the same concentration (2 × 10−4 mol·L−1).
| (a) |
| (b) |