fraction extracted, E

https://doi.org/10.1351/goldbook.F02503
The fraction of the total quantity of a substance extracted (usually by the solvent) under specified conditions, i.e. EA=QAQA′ where QA is the mass of A extracted and QA′ is the total mass of A present at the start.
Notes:
  1. E may be expressed as a percentage, %E.
  2. The term extractability is qualitative and should not be used as a synonym for fraction extracted.
  3. If the aqueous phase is extracted with n successive portions of solvent, the phase volume ratio (solvent/feed) being r each time, the fraction extracted is given by: En=1−(rD+1)−n If n=r=1 and E1=D1+D this expression is a concept of value in chromatography theory.
  4. The fraction extracted is also known as the recovery factor, especially for a multistage process.
Source:
PAC, 1993, 65, 2373. (Nomenclature for liquid-liquid distribution (solvent extraction) (IUPAC Recommendations 1993)) on page 2384 [Terms] [Paper]
Citation: 'fraction extracted' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.F02503 RIS BibTex EndNote
Div. VPDFTextXMLJSONQuantity