Ultrafast gas chromatographic method for quantitative determination of total FAMEs in biodiesel: An analysis of 90 s

FUEL

卷:222

Article

Bergamaschi Tercini, Antonio Carlos¹  Pinesi, Murilo¹  Calera, Gabrielle Cyntia¹  Sequinel, Rodrigo¹  Hatanaka, Rafael Rodrigues¹  de Oliveira, Jose Eduardo¹  Flumignan, Danilo Luiz^1,2 

[1] UNESP Sao Paulo State Univ, Inst Chem, Ctr Monitoring & Res Qual Fuels Biofuels Petr & D, Rua Prof Francisco Degni 55, BR-14800900 Araraquara, SP, Brazil

[2] IFSP Sao Paulo Fed Inst Educ Sci & Technol, Campus Matao,Rua Stefano DAvassi 625, BR-15991502 Matao, SP, Brazil

关键词: Biodiesel;    Ultrafast gas chromatography;    FAMEs;    Quality control;   

DOI  :  10.1016/j.fuel.2018.03.008

来源: Elsevier

【 摘 要 】

Several physicochemical parameters must be determined in order to verify the quality of commercial biodiesel, and the analysis of total fatty acid methyl esters (FAMEs) is the main parameter. Therefore, an efficient and alternative analytical method using gas chromatography coupled with ultrafast module is important. This method was developed to quantify FAMEs in biodiesel commercial samples that originated from different feedstock (babacu, coconut, rapeseed, corn, soybean, animal/palm oil and sunflower). The chromatographic run time is 90 s. When compared with the official methods, we had a much faster one, which provided an analytical frequency of up to 205 samples a day. This analytical method has been validated according to in-house validation parameters, such as linearity, repeatability, reproducibility (intermediate precision) and accuracy. Two analytical curves were prepared, one for determinate long carbon chain FAMEs (C16-C24) and another for short carbon chain FAMEs (C6-C14). The coefficient of determination (which represents the percentage of the data that is closest to the line of best fit) was 0.9992 for the C18 curve (long chain) and the C12 curve (short chain). Repeatability and reproducibility presented a relative standard deviation of 0.75% and 1.68% for the C18 curve and 0.44% and 1.05% for the C12 curve, respectively. The accuracy had a standard error of 0.2 for soybean biodiesel, 0.4 for animal/palm commercial biodiesel and 0.2 for babacu biodiesel.

【 授权许可】

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