2-Hydroxy-1-naphthaldehyde-P-hydroxybenzoichydrazone: A New Chromogenic Reagent for the Determination of Thorium(IV) and Uranium(VI)

Figure 1

Second-order derivative spectra of [Th(IV)-HNAHBH]. Amount of Th(IV) μg mL⁻¹: a = 0.234, b = 0.464, c = 0.696, d = 0.928, e = 0.139, and f = 1.856.