3. Results and discussion
3.1. Effect of heating
3.1.1. Effect of heating on spectra of oils
The original spectra of the eight unmixed samples of each kind of oil were showed in Fig. 1. It is obvious that each kind of oil had its own features differentiating from other kinds of oils. With the heating time extension, the right edge of the UV absorption band of all spectra shifted to right and the primitive features gradually disappeared. Meanwhile, new peaks generated. For example, in the case of RO, there were three peaks between 438 and 488 nm and another peak at about 670 nm in the original spectra of the unheated oil sample, and these peaks gradually disappeared with the increasing of heating time. When the heating time reached 3 h, a new peak at about 409 nm formed and moved toward long wavelength with the increasing of intensity.
3. Results and discussion3.1. Effect of heating3.1.1. Effect of heating on spectra of oilsThe original spectra of the eight unmixed samples of each kind of oil were showed in Fig. 1. It is obvious that each kind of oil had its own features differentiating from other kinds of oils. With the heating time extension, the right edge of the UV absorption band of all spectra shifted to right and the primitive features gradually disappeared. Meanwhile, new peaks generated. For example, in the case of RO, there were three peaks between 438 and 488 nm and another peak at about 670 nm in the original spectra of the unheated oil sample, and these peaks gradually disappeared with the increasing of heating time. When the heating time reached 3 h, a new peak at about 409 nm formed and moved toward long wavelength with the increasing of intensity.
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