July 12, 2020, 11:43:22 AM
Forum Rules: Read This Before Posting

Topic: Inconsistent liquid-liquid extraction yield.  (Read 327 times)

0 Members and 1 Guest are viewing this topic.

Offline Baeyesr

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Inconsistent liquid-liquid extraction yield.
« on: May 07, 2019, 05:46:44 AM »
Hi everyone

I'm currently doing some tests on the robustness of a liquid-liquid extraction and i have some results i cannot explain and cannot find in literature.
When i repeat the extraction multiple times, al my components mostly stay within 10% around the mean extraction yield. But some components (palmitic acid, erucamide and n-heptacosane) vary a lot and non consistent between tests. Sometimes only palmitic acid varies, sometimes all three.
I have attached a screenshot of one of my tests with most components censored because of secrecy reasons.

Thanks in advance!

Additional info:
All tests are spiked with an automatic syringe from the same stock solution.
Every extraction test consist of 3 extractions at varying pH (Neutral, acidic, alkaline)
Extracion yield is the area under a peak on a GCMS measurement.
« Last Edit: May 07, 2019, 08:26:05 AM by Baeyesr »

Offline phth

  • Chemist
  • Full Member
  • *
  • Posts: 470
  • Mole Snacks: +35/-4
Re: Inconsistent liquid-liquid extraction yield.
« Reply #1 on: May 10, 2019, 01:58:33 AM »
Surfactants coat surfaces. I would guess precipitates/coats the surfaces, micelles, and hard to tell.  Salt concentration varies and that effects the surface tension and how the molecules interact with the surface.

Sponsored Links