ASTM D7398-11(R2021) pdf free download

ASTM D7398-11(R2021) pdf free download.Standard Test Method for Boiling Range Distribution of Fatty Acid Methyl Esters (FAME) in the Boiling Range from 100 °C to 615 °C by Gas Chromatography
1. Scope
1.1 This test method covers the determination of the boiling range distribution offatty acid methyl esters (FAME). This test method is applicable to FAMES (biodiesel, B100) having an initial boiling point greater than 100 °C and a final boiling point less than 615 °C at atmospheric pressure as measured by this test method. 1.2 The test method can also be applicable to blends of diesel and biodiesel (B1 through B100), however precision for these samples types has not been evaluated. 1.3 The test method is not applicable for analysis of petroleum containing low molecular weight components (for example naphthas, reformates, gasolines, crude oils). 1.4 Boiling range distributions obtained by this test method are not equivalent to results from low efficiency distillation such as those obtained with Test Method D86 or D1160, especially the initial and final boiling points. 1.5 This test method uses the principles of simulated distil- lation methodology. See Test Methods D2887, D6352, and D7213. 1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.8 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 This test method makes reference to many common gas chromatographic procedures, terms, and relationships. Detailed definitions of these can be found in Practices E355, E594, and E1510.3.1.2 biodiesel, n—fuel composed of mono-alkyl esters of long chain fatty acids derived from vegetable oils or animal fats, designated B100. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 area slice, n—area resulting from the integration ofthe chromatographic detector signal within a specified retention time interval. In area slice mode (6.4.2), peak detection parameters are bypassed and the detector signal integral is recorded as area slices of consecutive, fixed duration time intervals. 3.2.2 atmospheric equivalent temperature (AET), n—temperature converted from the measured vapor tempera- ture obtained at sub-ambient pressure to atmospheric equiva- lent temperature (AET) corresponding to the equivalent boiling point at atmospheric pressure, 101.3 kPa (760 mm Hg), The AET is the expected distillate temperature if the distillation was performed at atmospheric pressure and there was no thermal decomposition. 3.2.3 corrected area slice, n—area slice corrected for base- line offset, by subtraction of the exactly corresponding area slice in a previously recorded blank (non-sample) analysis. 3.2.4 cumulative corrected area, n—accumulated sum of corrected area slices from the beginning ofthe analysis through a given retention time, ignoring any non-sample area (for example, solvent). 3.2.5 initial boiling point (IBP), n—temperature (corre- sponding to the retention time) at which a cumulative corrected area count equal to 0.5 % of the total sample area under the chromatogram is obtained. 3.2.6 final boiling point (FBP), n—temperature (corre- sponding to the retention time) at which a cumulative corrected area count equal to 99.5 % of the total sample area under the chromatogram is obtained.3.2.7 slice rate, n—frequency of data sampling or the frequency of data bunching provided that the frequency ofdata acquisition is larger than the frequency of bunching. The unit of frequency is points/seconds or Hz. 3.2.8 slice time, n—cumulative slice rate (analysis time) associated with each area slice throughout the chromatographic analysis. The slice time is the time at the end of each contiguous area slice. 3.2.9 total sample area, n—cumulative corrected area, from the initial point to the final area point.