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Synergistic Solvent Extraction of Manganese(II) by using Cupferron and Tetrabutylammonium ion  

In, Gyo (Department of Advanced Material Chemistry, Korea University)
So, Jin-Hwan (Anti-rusting & Coating Technology Research Team, Institute of Technology Research, Buhmwoo, Ltd.)
Choi, Jong-Moon (Department of Environmental Engineering, Dong-Hae University)
Kim, Young-Sang (Department of Advanced Material Chemistry, Korea University)
Publication Information
Analytical Science and Technology / v.17, no.1, 2004 , pp. 1-7 More about this Journal
Abstract
The synergistic solvent extraction of Mn(II) by N-nitroso-N-phenylhydroxylamineammonium salt (cupferron) and tetrabutylammonium ion ($TBA^+$) has been studied. In the presence of $TBA^+$, over 95% Mn(II) was extracted from an aqueous solution into chloroform by the cupferron in the pH range of 4 to 10. But a part of Mn(II) was extracted with only cupferron. The ternary complex of Mn(II) was more efficiently extracted into $CH_2Cl_2$ and $CHCl_3$ than other nonpolar solvents. The extracted Mn(II) was determined in the back-extracted $HNO_3$ solution by GF-AAS. This fixed procedure was applied to the determination of trace Mn(II) in tap water samples of pH 5.0. The detection limit equivalent to 3 times standard deviation of the background absorption was 0.37 ng/mL and Mn(II) was determined with the range of 0.4 to 1.01 ng/mL in our laboratory's tap water. And the recovery was 94 to 107% in samples in which 2.0 ng/mL Mn(II) was spiked. The interferences of common concomitant elements such as Cu(II), Ca(II), Fe(III) and so on were not shown up to $10{\sim}20{\mu}g/mL$. From these results, this procedure could be concluded to be applied for the determination of trace Mn(II) in other environmental water samples.
Keywords
Mn(II); cuferron; $TBA^+$; synergistic solvent extraction; GF-AAS;
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