Method and device for the quantitative determination of the content of waxes and wax-like substances in refined vegetable oils

摘要

1. A method for the quantitative determination of the content of waxes and wax-like substances in refined vegetable oils, in which a pre-prepared sample of vegetable oil at a given initial temperature is placed in a measuring cell of known geometry and made of known materials, it is cooled to a given final temperature, keeping it at this temperature a predetermined time, irradiate it with a luminous flux of a given spectral composition and control the amount of luminous flux passing through bu, irradiating the sample and changing its temperature is carried out jointly, while cooling the sample from the initial temperature is carried out with a given rate of temperature change to the temperature of complete solidification of the sample, while in addition to the light flux passing through the sample, the light flux scattered by the sample volume and the inner surface of the cuvettes, calculate, depending on temperature, the ratio of passing and scattered light fluxes and based on previously obtained on standard samples to the calibration curves determine the quantitative content of waxes and wax-like substances in the test sample of vegetable oil, characterized in that before starting the test, the sample is filtered through a paper filter, then the sample is thermostated for 10 minutes at a temperature of about 120 ° C, and after the temperature control, the measurement is started immediately; during cooling, the sample in the cuvette is alternately irradiated with optical radiation at two different wavelengths, continuously passing through the sample is continuously monitored, and