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

Figure 9

Second derivative spectra of AA, (1) 2×10⁻⁶, (2) 6×10⁻⁶, (3) 1×10⁻⁵, (4) 2×10⁻⁵, and (5) 2.4×10⁻⁵ mol L⁻¹.