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

<table>Second-order derivative spectra of (a) [Fe(II)-HNAHBH] and (b) [Co(II)-NAHBH]. Amount of Fe(II) (<i>μ</i>g mL<sup>−1</sup>): 0.055, 0.11; Co(II) (<i>μ</i>g mL<sup>−1</sup>): 3.53; 4.719.</table>

International Journal of Analytical Chemistry

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Figure 6

Figure 6: Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone 

Figure 6 | Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone 