Benzil-mono- (2-quinolyl) -hydrazone as a chelating agent for copper
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Summary
A 1∶1 complex between Cu(II) and BmQH may be extracted into benzene at pH 6 with an efficiency of 98% using a ligand concentration in the range 4×10−3 to 1×10−2M. The absorption maximum occurs at 520 nm and the complex has an apparent molar absorptivity of 40,000. This extraction-colorimetric method may be used to determine Cu(II) in the 0.3–2.0μg/ml range with no interference from 100-fold excesses of Zn(II), Mn(II), and Ni(II); however, Co(II), Cd(II), Fe(II) and Fe(III) do interfere.
Keywords
Copper Physical Chemistry Analytical Chemistry Benzene Inorganic ChemistryZusammenfassung
Kupfer(II) bildet mit einer 4×10−3- bis 1×10−2-molaren Lösung von Benzil-mono-(2-chinolyl)-hydrazon bei pH 6 einen Komplex, der sich zu 98% mit Benzol extrahieren läßt. Dessen Absorptionsmaximum liegt bei 520 nm, die molare Extinktion bei 40 000. Auch neben der hundertfachen Menge Zn(II), Mn(II) oder Ni(II) lassen sich 0,3-2,μg Cu/l extraktions-kolorimetrisch bestimmen; allerdings stören Co(II), Cd(II), Fe(II) und Fe(III).
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References
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