ASTM D6334 Test Method for Sulfur in Gasoline by Wavelength Dispersive X-Ray Fluorescence
12. Reporting
12.1 For samples analyzed without dilution, report the result calculated in 11.3. For samples that have been diluted, report the result calculated in 11.4. Report this result as the sulfur concentration in mg/kg to the nearest whole number. State that the results were obtained according to Test Method D6334.
13. Precision and Bias
13.1 The precision of the test method as obtained by statistical examination of interlaboratory test results is as follows:
NOTE 10 - The precision on methanol-containing samples has not been determined.
13.1.1 Repeatability - The difference between successive test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values in Table 3 only in one case in twenty.
13.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values in Table 4 only in one case in twenty.
13.2 Bias - Studies done in conjunction with the Western States Petroleum Association and the California Air Resources Board as well as ASTM Round Robins have shown that there is no significant bias between this test method and others available for the analysis of sulfur in light fuels at the appropriate levels. These include Test Methods D2622, D3210, D4045, D4294, and D5453
14. Keywords
14.1 analysis; gasoline; gasoline-oxygenate blend; petroleum; spectrometry; sulfur; X-ray
