Spectrophotometric Determination of Cr(III) and Pb(II) Using Their Complexes with 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene

<div>Absorption spectra of TEAC-Pb(II) complex at 458 nm with the increasing concentration of Pb(II) ion from 0.2 × 10<sup>−5</sup> M to 20 × 10<sup>−5</sup> M as TEAC blank.</div>

Journal of Analytical Methods in Chemistry

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Figure 4

Figure 4: Spectrophotometric Determination of Cr(III) and Pb(II) Using Their Complexes with 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene 

Figure 4 | Spectrophotometric Determination of Cr(III) and Pb(II) Using Their Complexes with 5,11,17,23-Tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]calix[4]arene 