Spectrophotometric Determination of Gold(III) Using 2-Hydroxy-3-Methoxy Benzaldehyde Thiosemicarbazone as a Chromophoric Reagent

Figure 3

Ni(II)–HMBATSC versus reagent blank; Ni(II) (μg mL⁻¹) = (1) 0.245; (2) 0.490; (3) 0.735; (4) 0.980; other conditions as in standard procedure.

(a) First derivative spectra

(b) Second derivative spectra