ASTM D2786 for Hydrocarbon Types Analysis of Gas-Oil Saturates Fractions
ASTM D2786 Standard Test Method for Hydrocarbon Types Analysis of Gas-Oil Saturates Fractions by High Ionizing Voltage Mass Spectrometry
11. Precision and Bias
11.1 The precision of this test method as obtained by statistical examination of interlaboratory test results on a sample having the composition given in Table 1, is as follows:
11.1.1 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 values shown in Table 2 only in one case in twenty.
11.1.2 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 values shown in Table 2 only in one case in twenty.
NOTE 4 - If samples are analyzed that differ appreciably in composition from the sample used for the interlaboratory study, this precision statement may not apply.
11.2 Bias - The quantities determined are defined by the conditions employed in this empirical method, and a statement of bias is therefore not appropriate.
12. Keywords
12.1 gas oil; mass spectrometry; petroleum; saturates
