Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone

<table>Third-order derivative spectra of [Co(II)-HNAHBH]. Amount of Co(II) <i>μ</i>g mL<sup>−1</sup>: a = 0.059, b = 0.118, c = 0.236, and d = 0.354.</table>

International Journal of Analytical Chemistry

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Figure 5

Figure 5: Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone 

Figure 5 | Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone 