期刊
TALANTA
卷 117, 期 -, 页码 376-381出版社
ELSEVIER
DOI: 10.1016/j.talanta.2013.08.025
关键词
Cloud point extraction; Triton X-100; Salting-out effect; Copper ion; Visual determination
资金
- Grants-in-Aid for Scientific Research [23615003] Funding Source: KAKEN
A method for the separation and concentration of trace copper(II) ion (Cu(II)) via cloud point extraction (CPE) using a nonionic surfactant with a salting-out effect was developed and applied as a technique for the visual determination of Cu(II). Triton X-100 (TX-100), which has a cloud point at 64-67 degrees C in aqueous solutions, was used as the nonionic surfactant for the CPE of Cu(II). Although CPE with TX-100 requires heating of the solution to separate the surfactant-rich phase from the aqueous phase, the new method achieves phase separation at 15-30 degrees C owing to the addition of a large amount of salt to the solution, which lowers the cloud point. The compound 1,5-diphenylthiocarbazone (dithizone) was selected as the chelating agent for complexation and transfer of Cu(II) to the surfactant-rich phase. The extractability of Cu(II) (initial concentration: 10 mu M) was 96.6 +/- 2.1% when Na2SO4 was added to a 20% TX-100/4 mu M dithizone solution (pH 2). Using this method, the visual determination of Cu(II) was possible for concentrations ranging from 0.01 to 10 mu M. In addition, the extraction system was successfully applied to the visual determination of Cu(II) in a river water sample. (C) 2013 Elsevier B.V. All rights reserved.
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