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Impurities in Biodiesel on Rtx-Biodiesel TG by ASTM D6584

PeakstR (min)
2.1,2,4-Butanetriol (IS)5.50
3.Monoglyceridesas shown
4.Tricaprin (IS)19.19
5.Diglycerides20.16 - 20.9
6.Triglycerides22.27 - 25.15
ColumnRtx-Biodiesel TG with 2 m x 0.53 mm ID retention gap, 15 m, 0.32 mm ID, 0.1 µm (cat.# 10293)
Standard/SampleSoy B100 biodiesel
Tricaprin (1,2,3-tricaprinoylglycerol) (cat.# 33025)
(s)-(-)-1,2,4-Butanetriol (cat.# 33024)
Inj. Vol.:1 µL cool on-column
Temp. Program:Track oven
Oven Temp.:50 °C (hold 1 min) to 180 °C at 15 °C/min to 230 °C at 7 °C/min to 380 °C at 30 °C/min (hold 2 min)
Carrier GasH2, constant flow
Flow Rate:2.7 mL/min
DetectorFID @ 380 °C
InstrumentAgilent 7890B GC
Sample PreparationSample preparation followed ASTM D6584-17: Soy biodiesel B100 was fortified with internal standards (butanetriol and tricaprin) and derivatized using MSTFA.