ASTM D7806-12

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Designation: D7806 − 12
Standard Test Method for
Determination of the Fatty Acid Methyl Ester (FAME)
Content of a Blend of Biodiesel and Petroleum-Based Diesel
1
Fuel Oil Using Mid-Infrared Spectroscopy
This standard is issued under the fixed designation D7806; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope of Petroleum and Petroleum Products
D6299 Practice for Applying Statistical Quality Assurance
1.1 This test method covers the determination of the content
and Control Charting Techniques to Evaluate Analytical
of biodiesel (fatty acid methyl esters—FAME) in diesel fuel
Measurement System Performance
oils. It is applicable to concentrations from 1 to 30 volume %.
D6751 Specification for Biodiesel Fuel Blend Stock (B100)
This procedure is applicable only to FAME. This test method
for Middle Distillate Fuels
is not appropriate for the determination of the concentration of
E131 Terminology Relating to Molecular Spectroscopy
biodiesel that is in the form of fatty acid ethyl esters (FAEE).
E168 Practices for General Techniques of Infrared Quanti-
1.2 The values stated in SI units are to be regarded as the
tative Analysis
standard. The values given in parentheses are for information
E1655 Practices for Infrared Multivariate Quantitative
only.
Analysis
1.3 This standard does not purport to address all of the E2056 Practice for Qualifying Spectrometers and Spectro-
safety concerns, if any, associated with its use. It is the
photometers for Use in Multivariate Analyses, Calibrated
responsibility of the user of this standard to establish appro- Using Surrogate Mixtures
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3. Terminology
3.1 Definitions:
2. Referenced Documents
3.1.1 biodiesel, n—a fuel composed of mono-alkyl esters of
2
2.1 ASTM Standards:
long chain fatty acids derived from vegetable oils or animal
D975 Specification for Diesel Fuel Oils
fats, designated B100 in Specification D6751.
D1298 Test Method for Density, Relative Density (Specific
3.1.2 biodiesel blend, BXX, n—a blend of biodiesel fuel
Gravity), or API Gravity of Crude Petroleum and Liquid
with petroleum-based diesel fuel.
Petroleum Products by Hydrometer Method
3.1.2.1 Discussion—In the abbreviation BXX, the XX rep-
D4052 Test Method for Density, Relative Density, and API
resents the percentage by volume of biodiesel fuel in the blend.
Gravity of Liquids by Digital Density Meter
D4057 Practice for Manual Sampling of Petroleum and 3.1.3 diesel fuel oil, n—a petroleum-based diesel fuel, as
Petroleum Products
described in Specification D975.
D4177 Practice for Automatic Sampling of Petroleum and
3.1.4 FAME, n—a biodiesel composed of long chain fatty
Petroleum Products
acid methyl esters derived from vegetable or animal fats.
D4307 Practice for Preparation of Liquid Blends for Use as
3.1.5 Mid-Infrared Spectroscopy, n—uses the mid-infrared
Analytical Standards
region of the electromagnetic spectrum, as described in Termi-
D5854 Practice for Mixing and Handling of Liquid Samples
nology E131.
1 4. Summary of Test Method
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
4.1 A sample of diesel fuel or biodiesel blend is introduced
D02.04.0F on Absorption Spectroscopic Methods.
into a liquid sample cell having a specified path length.Abeam
Current edition approved Sept. 1, 2012. Published November 2012. DOI:
10.1520/D7806-12
of infrared light is imaged through the sample onto a detector,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and the detector response is determined. Wavelengths of the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
absorption spectrum that correlate highly with biodiesel or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. interferences are selected for analysis. Mathematical analysis
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D7806 − 12
convertsthedetectorresponsefortheselectedareasorpeaksof 7.1.1.1 The noise level shall be established by taking and
the spectrum of an unknown to a concentration of biodiesel. ratioing two successive single beam spectra of dry air. The
single beam spectra obtained can be the average of multiple of
4.2 This test method can utilize two different types of
FTIR scans. The noise of the spectrum at 10
...