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Wen H.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | Xu L.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | Lu H.,National Quality Supervision & Testing Center for Petroleum Products Shenyang | Hu J.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | And 2 more authors.
Shiyou Huagong/Petrochemical Technology | Year: 2015

A two dimensional gas chromatography for the determination of methylal in gasoline by capillary fl ow(Deans Switch) heart cutting technology was established with the series connection of nonpolar capillary column DB-1 and polar capillary column CP-LOWOX. A gasoline sample was separated fi rstly with the DB-1 column, and then by the optimized heart cutting, oxy-compounds in the sample were switched to the CP-LOWOX column for further separation. The Methylal and other 13 oxy-compounds (methanol, ethanol, etc.) could be separated and determined with 1, 2-dimethoxyethane as internal standard. The results showed that the calibration curve of methylal was linear in its concentration range of 0.01%-5.00%(w) with a correlation coeffi cient 0.999 9. The methylal recoveries in gasoline samples were in the range of 97.83%-104.11%, the relative standard deviations of six repeated determinations were less than 2.00%, and the detection limit of the methylal was 0.003%(w). ©, 2015, Beijing Research Institute of Chemical Industry. All right reserved.


Zhang W.-M.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | Wen H.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | LU H.-M.,National Quality Supervision & Testing Center for Petroleum Products Shenyang | Liu H.-Q.,National Quality Supervision & Testing Center for Petroleum and Petrochemical Products Guangdong | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2015

A simple and accurate method was developed for determining silicon in gasoline using inductively coupled plasma optical emission spectroscopy (ICP-OES). For sample inroduction a Burgener nubulizer and a Cyclonic spray chamber were used. A gasoline sample was diluted with isooctane and then introduced into the cooled spray chamber of the ICP-OES. Good linearity was achieved in the silicon concentration range 0.1~10.0 mg·kg-1, and the correlation coefficient was 0.999 96. The detection limit for silicon was 0.012 mg·kg-1 and the silicon recoveries from gasoline samples were 95.8%~98.4%, with relative standard deviations of less than 3.0%. The method was proved to be simple, reliable and highly sensitive, and suitable for determining silicon in samples of motor gasoline, ethanol-gasoline and methanol-gasoline fuel mixtures those containing not more than 15% (V/V) oxygenates. ©, 2015, Science Press. All right reserved.

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