Environmental Method to Determine Dopamine and Ascorbic Acid Simultaneously via Derivative Spectrophotometry

Figure 6

First derivative spectra of DA, (1) 2×10⁻⁶, (2) 6×10⁻⁶, (3) 1×10⁻⁵, (4) 2×10⁻⁵, (5) 2.4×10⁻⁵, (6) 3×10⁻⁵, (7) 4×10⁻⁵, and (8) 5×10⁻⁵ mol L⁻¹.