How Can I Determine Vegetable Oil Concentration in Aerated Emulsions?

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SUMMARY

This discussion focuses on determining the concentration of vegetable oil in aerated oil-water emulsions, specifically those with a concentration of approximately 2.4 w%. The user initially attempted the density method but faced challenges due to vaporization of water and the presence of gas bubbles. A recommended solution involves using a mixture of tetrahydrofuran (THF) or ethyl acetate and ethanol to break the emulsion, followed by employing Karl Fischer titration for accurate water determination in the diluted sample.

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  • Understanding of oil-water emulsions and their properties
  • Familiarity with density measurement techniques
  • Knowledge of chromatography methods
  • Experience with Karl Fischer titration for moisture analysis
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  • Research the application of tetrahydrofuran (THF) in breaking emulsions
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  • Study Karl Fischer titration methods for accurate moisture content determination
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Chemists, food scientists, and laboratory technicians involved in emulsion analysis and formulation, particularly those working with vegetable oils and moisture content determination.

androol
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I've been trying to determine the concentration of a vegie oil (0.9 g/mL) in dilute(~2,4 w%) oil-water emulsions that are badly aerated and with gas bubbles.

I tried the density method, weighing the samples and then vacuum suck them to rid the bubbles - in order to get an accurate volume reading. But then I realized that water was vaporizing a little. and the dilute samples make the determination really hard.

Is there a way that's fast and easy to do that? chromotography?

Please help me... on my knees...
 
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Add THF or a mixture of ethyl acetate and ethanol to break the emulsion. The water should be easy to determine on the diluted sample using a Karl-Fisher titration.
 

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