1. Scope
1.1 This test method describes an anion exchange chromatography procedure for determining free and total glycerin content of biodiesel (B100) and blends (B0B20) with diesel fuel oils defined by Specifications D 6751 and D 975 Grades 1-D, 2-D, and low-sulfur 1-D and 2-D. It is intended for the analysis of biodiesel blend samples containing between 0.5- to 50-mg/kg total glycerin. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Material Safety Data Sheets are available for reagents and materials. Review them for hazards before usage.
Petroleum-based diesel may be blended with biodiesel. High levels of free glycerin can cause injector deposits as well as clog fuel systems. Low levels of total glycerin ensure that high conversion of the oil or fat into its monoalkyl ester has taken place. High levels of mono-, di-, and triglycerides can cause injector deposits and may adversely affect cold-weather operation and filter plugging.
Keywords
biodiesel blends; free glycerin; glycerin; total glycerin; ion chromatography
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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