Materials
Biodiesel, Palm Stearin Methyl Ester (PSME), was received from commercial source as shown in Figure 4. Some physico-chemical properties of PSME were summarized in Table 1.
Methodology
When keeping the PSME under ambient condition, the white sediment becomes self-separated as a solid phase at the bottom and was collected them for GC analysis as shown in Figure 5. The sediment was examined by Determination of Ester and Linolenic Acid Methyl Ester Content and Determination of Free and Total glycerol and mono-, di-, triglyceride Content based on EN 14103 [5] and EN14105 [6] standards, respectively.