Oil UV extinction coefficient measurement using a standard spectrophotometer

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Accurate measurement of optical properties is crucial for characterizing oils.
• Existing techniques for determining the extinction coefficient of oils in the near UV may lack precision or ease of use.

Purpose of the Study:

• To investigate and identify optimal techniques for measuring the extinction coefficient of oils in the near UV spectrum.
• To validate Beer's law for oil samples and propose a spectral fitting function.

Main Methods:

• Exploration of various measurement techniques for extinction coefficient in the near UV.
• Implementation and validation of the "unknown thickness method" using standard spectrophotometry.
• Experimental verification of Beer's law applicability to oils.

Main Results:

• The "unknown thickness method" emerged as the most precise and user-friendly technique.
• Beer's law was confirmed to be valid for the investigated oils.
• A simple function was developed for fitting extinction coefficient spectra.

Conclusions:

• The "unknown thickness method" is a highly effective technique for determining oil extinction coefficients.
• The proposed method simplifies oil characterization using readily available spectrophotometers.
• This research provides a validated approach for spectral analysis of oils.