Estimation of trace amounts of benzene in solvent-extracted vegetable oils and oil seed cakes
2000
A new method is presented for the qualitative and quantitative
estimation of trace amounts (up to 0.15 ppm) of benzene in crude as well as
refined vegetable oils obtained by extraction with food grade hexane (FGH),
and in the oil seed cakes left after extraction. The method involves the
selection of two solvents; cyclohexanol, for thinning of viscous vegetable
oil, and heptane, for azeotroping out trace benzene as a concentrate from
the resulting mixture. Benzene is then estimated in the resulting azeotrope
either by UV spectroscopy or by GC-MS subject to availability and cost
effectiveness of the latter. Repeatability and reproducibility of the
method is within 1–3% error. This method is suitable for estimating
benzene in vegetable oils and oil seed cakes.
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