Test method for determination of fatty acid methyl esters and linolenic acid methyl ester contents in biodiesel by gas chromatography
1 Scope
1.1 This standard specifies the methods for determination of ester content of fatty acid methyl esters (FAME) intended for use as pure biofuel or as a blending component for heating and diesel fuels. It also allows to determine the linolenic acid methyl ester content.
1.2 This standard is used to determine the ester content of FAME is greater than 90% (m/m) and that the linolenic acid content is between 1% (m/m) and 15% (m/m).
1.3 This standard is suitable for FAME which contain methyl esters between C14 and C24.
2 Normative References
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 4756 Petroleum liquids - Manual sampling (GB/T 4756-1998, eqv ISO 3170:1988)
GB/T 17377 Animal and vegetable fats and oils - Analysis by gas chromatography of methyl esters of fatty acids (GB/T 17377-1998, eqv ISO 5508:1990)
ISO 4259 Petroleum products - Determination and application of precision data in relation to methods of test
3 Principle
The test sample with a predetermined amount of methyl heptadecanoate internal standard was introduced into the gas chromatography system. The fatty acid methyl esters in the sample were separated by a strong polar capillary chromatographic column with polyethylene glycol as the stationary phase. They were then detected using a flame ionization detector and quantified using the internal standard method to obtain the content of fatty acid methyl esters and linolenic acid methyl esters.
Foreword II
1 Scope
2 Normative References
3 Principle
4 Reagents and materials
5 Apparatus
6 Sampling
7 Procedure
8 Calculation and report
10 Report
Annex A (Informative) Results of interlaboratory test
Annex B (Informative) Comparison of clause/subclause numbers of this standard and EN 14103: 2003
