TS No. 25: Determination of Free and Total Glycerol and Mono-, Di-, Triglyceride Contents in Biodiesel August 26, 2024February 18, 2020 by Norsuzaini Based on EN 14105. The determination is by gas chromatography with internal calibration. The contents are expressed in percentages (w/w), to the nearest 0.01%. Main Research: Harrison Lau Lik Nang