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  Application Note: Determination of Methanol Content in Pure Biodiesel (B100) by Headspace-GC in Compliance with EN 14110
 AN10216 describes the use of the Thermo Scientific TRACE GC Ultra and TriPlus HS autosampler for the determination of residual methanol in B100 biodiesel according to EN 14110
 
Monitoring residual methanol in B100 biodiesel is a matter of safety since even small amounts of this material can reduce the flash point of the biodiesel. Moreover, residual methanol can affect fuel pumps, seals and elastomers and can result in poor combustion properties. EN 14110 requires a headspace GC method, based on either polar or non-polar columns, and is applicable for a concentration range from 0.01% m/m to 0.5% m/m of methanol (MeOH). The method is not applicable to mixtures of FAME that contain other low boiling components.

This note describes the use of the Thermo Scientific TRACE GC UltraTM equipped with a split/splitless (SSL) injector and flame ionization detector (FID), along with the Thermo Scientific TriPlusTM  Headspace Autosampler. This system allows for determination of methanol in B100 biodiesel in full compliance with method EN 14110. The analysis of methanol by headspace was performed using an external calibration procedure, which is preferred over internal standard calibrations when automatic headspace equipment is used.