1994 Fiscal Year Final Research Report Summary
Separation of metals by a simultaneous extraction and back-extraction method with Teflon phase separator
| Project/Area Number |
05640691
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
分離・精製・検出法
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| Research Institution | SCIENCE UNIVERSITY OF TOKYO |
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Principal Investigator |
WATANABE Kunihiro Science University of Tokyo, Faculty of Science and Technology, Associate Professor, 理工学部, 助教授 (40084470)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Simultaneous extraction and back-extraction method / Teflon phase separator / PAN / Separation of Fe, Co and Ni / 連結抽出 |
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| Research Abstract |
A new method, which is similar to a liquid membrane method, was inve stigated for simultaneous extraction and back-extraction and back-extrac tion using two vessels with Teflon phase separators. The absorbance of metal complexes extracted was measured by a spectrophotometor with a flow cell. PAN [1- (2-pyridylazo) -2-naphthol] was used as a ionophore because of its high sensitivity. The condition for the separation and the determination of iron (II) , cobalt (II) and nickel (II) were examined under high speed stirring (2500rpm). After extraction of iron and cobalt complex to the chloroform phase, iron complex was back-extracted woth 6M HNO_3 solution immediately. The cobalt complex remained in the organic phase. Nickel-PAN was partially extracted at pH 4 after 40 min by a conventional extraction-procedure, which used a separatory funnel, in spite of the slow complex formation reaction.By the present method, the excess reagent (PAN) with iron complex was back-extracted into 6 M HNO_3 solution. The extraction rate for the nickel-PAN complex decreased with the extraction time.Consequently, the nickel-complex was not extracted at pH 4 into the chloroform by the present method.
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Research Products
(4 results)
