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Citation: Yao Binghua, Nagaosa Yukio, Satake Masatada. Study on the Extraction Equilibria of Cd(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) with Bis(2-ethylhexyl)phosphonic Acid[J]. Chinese Journal of Applied Chemistry, ;1999, 16(3): 25-28. shu

Study on the Extraction Equilibria of Cd(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) with Bis(2-ethylhexyl)phosphonic Acid

1.
a Department of Applied Chemistry, Xi'an University of Science and Technology, Xi'an 710048;
2.
b Faculty of Engineering, Fukui University, Bunkyo, Fukui 910, Japan

Received Date: 19 August 1998
Available Online: 8 March 1999

The extraction equilibria of Cd(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) using a Naphtezol M solution containing bis(2-ethylhexyl) phosphonic acid(PIA-8,HL) have been investigated in 1.0 mol/L (NH₄)₂SO₄ (298 K). The oligomerization number, stoichiometry and conditional extraction constants of the extracted species were determined. The results indicated that the metal ions as monomeric species: CdL₂·3HL and CdL₂·4HL for Cd(Ⅱ), CoL₂·HL and CoL₂·3HL for Co(Ⅱ), and NiL₂·3HL and NiL₂·5HL for Ni(Ⅱ) were extracted into Naphtezol M phase.
- cadmium,
- cobalt,
- nickel,
- solvent extraction,
- bis(ethylhexyl)phosphinic acid
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