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Continuous Liquid-Liquid Extraction of Medium-Chain Fatty Acids from Fermentation Broth Using Hollow-Fiber Membranes
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Liquid-solid extraction system based on between 40-salt-H(2)O without organic solvents.

B Li1, R Meng

  • 1Department of Chemistry, South-Central College for Nationalities, Wuhan, Hubei, 430074, People's Republic of China.

Talanta
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

Tween 40 solutions separate into liquid and solid phases with salts, enabling the extraction and determination of zirconium (Zr) and uranium (U) by controlling acidity.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Separation Science

Background:

  • Aqueous solutions of nonionic surfactants like Tween 40 exhibit phase separation in the presence of salts.
  • This phenomenon, known as liquid-liquid phase separation or surfactant precipitation, is influenced by surfactant concentration, salt type and concentration, and solution pH.
  • Understanding these phase behaviors is crucial for developing novel separation and extraction techniques.

Purpose of the Study:

  • To investigate the phase behavior of aqueous Tween 40 solutions with various salts.
  • To examine the distribution of metal ions (Zr(IV), U(VI), Fe(III), Pb(II)) and photometric reagents between the surfactant-rich phase and the aqueous phase.
  • To develop a method for the quantitative extraction, separation, and determination of Zr(IV) or U(VI) in the presence of Pb(II).

Main Methods:

  • Preparation of aqueous Tween 40 solutions with varying concentrations.
  • Addition of different salts (e.g., sulfates, chlorides) to induce phase separation.
  • Analysis of the distribution of target analytes (Zr(IV), U(VI), Fe(III), Pb(II), photometric reagents) between the two phases using techniques like spectrophotometry.
  • Systematic variation of solution acidity (pH) to optimize extraction and separation.

Main Results:

  • Aqueous Tween 40 solutions demonstrated phase separation under specific salt concentrations and compositions.
  • The distribution coefficients of Zr(IV), U(VI), Fe(III), Pb(II), and photometric reagents were found to be dependent on salt type, concentration, and solution acidity.
  • Quantitative extraction and separation of Zr(IV) or U(VI) from Pb(II) were successfully achieved by precise control of the solution acidity.
  • The extraction mechanism was preliminarily investigated.

Conclusions:

  • The phase separation of Tween 40 solutions in the presence of salts provides a viable medium for selective extraction of metal ions.
  • Controlling solution acidity is a key factor for achieving efficient separation and determination of target analytes like Zr(IV) and U(VI).
  • This surfactant-based separation technique holds potential for applications in analytical chemistry, particularly for the analysis of complex samples.