ASTM-D7757 2012

$40.63

D7757-12 Standard Test Method for Silicon in Gasoline and Related Products by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry

Published By	Publication Date	Number of Pages
ASTM	2012	9

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Categories: 75.160.20 - Liquid fuels, ASTM

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Description

ASTM D7757-12

Historical Standard: Standard Test Method for Silicon in Gasoline and Related Products by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry

ASTM D7757

Scope

1.1 This test method covers the determination of total silicon by monochromatic, wavelength-dispersive X-ray fluorescence (MWDXRF) spectrometry in naphthas, gasoline, RFG, ethanol and ethanol-fuel blends, and toluene at concentrations of 3 to 100 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 3 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.

Note 2—Aromatic compounds such as toluene are under the jurisdiction of Committee D16 on Aromatic Hydrocarbons and Related Chemicals. However, toluene can be a contributor to silicon contamination in gasoline (see 4.4), thus its inclusion in this test method.

1.2 Gasoline samples containing ethanol and other 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 Section 5, Interferences.

1.3 Samples with silicon concentrations above 100 mg/kg can be analyzed after dilution with appropriate solvent. The precision and bias of silicon determinations on diluted samples have not been determined and may not be the same as shown for neat samples (Section 16).

1.4 A fundamental assumption in this test method is that the standard and sample matrices are well matched, or that the matrix differences are accounted for (see 13.5). Matrix mismatch can be caused by C/H ratio differences between samples and standards or by the presence of other interfering heteroatoms; observe the cautions and recommendations in Section 5.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 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.

Keywords

analysis; ethanol; fuel; gasoline; monochromatic X-ray; MWDXRF; silicon; spectrometry; wavelength dispersive X-ray fluorescence; WDXRF; X-ray

ICS Code

ICS Number Code 75.160.20 (Liquid fuels)

DOI: 10.1520/D7757-12

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Summary of Test Method Significance and Use
2	Interferences FIG. 1
3	Apparatus FIG. 2 TABLE 1
4	Reagents and Materials FIG. 3 FIG. 4
5	Hazards Sampling and Sample Handling Preparation of Apparatus and Specimens for Analysis
6	Calibration Procedure
7	Calculation Report Quality Control Precision and Bias
8	Keywords A1. MATRIX CORRECTION A1.1 A1.2 A1.3 A1.4 TABLE 2
9	X1. DETERMINING COUNT TIME X1.1 X1.2 X1.3

Additional information

Standard Title	D7757-12 Standard Test Method for Silicon in Gasoline and Related Products by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry
Published Code	ASTM
Publication Date	2012
Pages Count	9
ICS Codes	75.160.20 - Liquid fuels