Abstract
The copper(11)-α, β, γ, δ-tetrakis(1-methylpyridinium-3-yl)porphine [T(3-MPy)P or H2L4+] complex, a tetra-positive macro-molecule, was extracted quantitatively and selectively into 2-nitropropane from the acidic solution containing a large amount of perchlorate ion in the form of the ion-association complex, CuL(ClO4)4, with keeping the excess of T(3-MPy)P in the aqueous phase. On this basis, a highly sensitive and selective method for the determination of copper at ppb levels has been developed. The apparent molar absorption coefficient and the sensitivity for 0.001 absorbance were 4.0 × 105 M-1·cm-1 and 0.16 ng·cm-2, respectively. The interference of 17 cations and 4 anions usually encountered were examined, and found to be minimal. The method developed could be applied successfully to the determination of copper in real samples.
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