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ASTM D 7039 Document Information:
Title
Standard Test Method for Sulfur in Gasoline and Diesel Fuel by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry
ASTM International
Publication Date:
May 1, 2007
Scope:
This test method covers the determination of total sulfur by
monochromatic, wavelength-dispersive X-ray fluorescence (MWDXRF)
spectrometry in single-phase gasolines, diesel fuels, and refinery
process streams used to blend gasoline and diesel, at
concentrations from 2 mg/kg to 500 mg/kg. The precision of this
test method was determined by an interlaboratory study using
representative samples of the liquids described in 1.1 and 1.2. The
pooled limit of quantitation (PLOQ) was estimated to be 4
mg/kg.
NOTE 1—Volatile samples such as high-vapor-pressure gasolines or
light hydrocarbons might not meet the stated precision because of
the evaporation of light components during the analysis.
Gasoline samples containing oxygenates may be analyzed with this
test method provided the matrix of the calibration standards is
either matched to the sample matrices or the matrix correction
described in Annex A1 is applied to the results. The conditions for
matrix matching and matrix correction are provided in the
Interferences section (Section 5).
Gasolines and diesels with sulfur contents above 500 mg/kg can
be analyzed after dilution with appropriate solvent (see 5.2). The
precision and bias of sulfur determinations on diluted samples has
not been determined and may not be the same as shown for neat
samples (Section 15).
When the elemental composition of the samples differ
significantly from the calibration standards used to prepare the
calibration curve, the cautions and recommendation in Section 5
should be carefully observed.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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. For specific hazard information, see
3.1.
*A Summary of Changes section appears at the end of this
standard.
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