非常抱歉，我们暂时无法提供预览，您可以试试： 免费下载 ASTM D6839-2016 前三页，或者稍后再访问。
5.1x00a0;A knowledge of spark-ignition engine fuel composition is useful for regulatory compliance, process control, and quality assurance.
5.2x00a0;The quantitative determination of olefins and other hydrocarbon types in spark-ignition engine fuels is required to comply with government regulations.
5.3x00a0;This test method is not applicable to M85 fuels, which contain 858201;% methanol.
1.1x00a0;This test method covers the quantitative determination of saturates, olefins, aromatics, and oxygenates in spark-ignition engine fuels by multidimensional gas chromatography. Each hydrocarbon type can be reported either by carbon number (see ) or as a total.
Note 1:x00a0;There can be an overlap between the C9 and C10 aromatics; however, the total is accurate. Isopropyl benzene is resolved from the C8 aromatics and is included with the other C9 aromatics.
1.2x00a0;This test method is not intended to determine individual hydrocarbon components except benzene.
1.3x00a0;This test method is divided into two parts, Part A and Part B.
1.3.1x00a0;Part A is applicable to automotive motor gasoline for which precision (Table8201;9) has been obtained for total volume fraction of aromatics of up to 50 %; a total volume fraction of olefins from about 1.5 % up to 30 %; a volume fraction of oxygenates, from 0.8 % up to 15 %; a total mass fraction of oxygen from about 1.5 % to about 3.7 %; and a volume fraction of benzene of up to 2 %. Although this test method can be used to determine higher-olefin contents of up to 50 % volume fraction, the precision for olefins was tested only in the range from about 1.5 % volume fraction to about 30 % volume fraction. The method has also been tested for an ether content up to 228201;% volume fraction but no precision data has been determined.
188.8.131.52x00a0;This test method is specifically developed for the analysis of automotive motor gasoline that contains oxygenates, but it also applies to other hydrocarbon streams having similar boiling ranges, such as naphthas and reformates.
1.3.2x00a0;Part B describes the procedure for the analysis of oxygenated groups (ethanol, methanol, ethers, C3 to C5 alcohols) in ethanol fuels containing an ethanol volume fraction between 50 % and 85 % (178201;% to 298201;% oxygen). The gasoline is diluted with an oxygenate-free component to lower the ethanol content to a value below 20 % before the analysis by GC. The diluting solvent should not be considered in the integration, this makes it possible to report the results of the undiluted sample after normalization to 100 %.
Copyright ©2007-2016 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证：京ICP证110310号