Abstract
Procedures for the rapid determination of BHT, BHA, Dowtherm and Neo-SK-oil in fatty oil were presented by authors. Fatty oils containing antioxidants or heat transfer medium are directly injected into precolumn which is attached to gas chromatograph to protect the main column from contamination with the unvolatiles. Each analysis takes only 20min. at maximum. Gas chromatograph-mass spectroscopy system was found useful for the final identification of the antioxidant peaks. Investigation of the change of BHT and BHA contents in heated oils by the precolumn method showed the monotonical decrease of the contents under the effective stirring at 180210°C.
