I have used ethyl acetate as a solvent for extraction of acetic acid from pyrolysis oil in 1:1 ratio. I have a HP5 (30mX0.32mm) column
Gas Chromatography with an internal standard or coupled to a (Tandem) Mass Spectrometer is commonly employed, although the acetic acid might damage your column.
HPLC or LC-MS are also possible, using an 8% cross-linked sulfonated polystyrene cation exchanger and an ethanol gradient mobile phase.
Capillary Electrophoresis (CE) with UV detection would work, if the sample concentrations are within the LOD of the instrument. You can calculate it from the following literature values:
Acetic Acid (pH~7)
λmax: 200nm
Amax: 0.670
Ɛmax: 67
(McConnell et al.)
If you're really hard-up, you can titrate 0.1N NaOH in conjunction with a pH meter, and calculate the concentration based on the inflection point (assuming HOAc is the only acid in your extract).
For a decent sampling of methods you can check out PubChem: https://pubchem.ncbi.nlm.nih.gov/compound/176#section=Analytic-Laboratory-Methods
Please look at the following below links which may help you in your analysis:
https://pdfs.semanticscholar.org/3494/4e9eaca116832bb834f5b1418cdcb07767c5.pdf
Thanks
Please have a look here:
https://www.researchgate.net/project/Determination-of-organic-acids-in-diesel-and-oil-matrices
and
Technical Report Determination of formic and acetic acids in petroleum produc...
I hope this helps.
Please let me know in case of any questions.
Good luck with your research
Detlef.
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