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- E-ISSN 2288-8985
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- P-ISSN1225-0163
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Extraction Equilibria and Analytical Application of Metal-Dithizone Complexes(II) Partition and Extraction Equilibria into Chloroform
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1997, v.10 no.5, pp.370-377
Choi,
Y., Choi,
H., &
Kim,
Y.
(1997). Extraction Equilibria and Analytical Application of Metal-Dithizone Complexes(II) Partition and Extraction Equilibria into Chloroform. Analytical Science and Technology, 10(5), 370-377.
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Abstract
The several fundamental parameters on the solvent extraction of Co(II), Cu(II) and Zn(II) with dithizone were investigated. The value of <TEX>$K_{a1}/K_p$</TEX> of dithizone(at <TEX>$25^{\circ}C$</TEX>) between an aqueous phase and a chloroform was found to be <TEX>$4.72{\times}10^{-11}$</TEX>. And the mole ratios of metal ion to dithizone in its metal complexes were determined by mole ratio method. The extractibilities(%) for metal-dithizone chelates were obtained from the extraction equilibria of metal-dithizone complexes between an aqueous phase and a chloroform as follows. Co(II) : 92.3% at pH 8.0 : Cu(II) : 97.1% at pH 4.0 and Zn(II) : 99.0% at pH 7.0. And also, in optimum experimental conditions the extraction constants of Co(II), Cu(II) and Zn(II) were examined.
- keywords
- dithizone, extractability, distribution ratio, extraction constant
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