ASTM D6352 test method for boiling range distribution of petroleum distillates
ASTM D6352 standard test method for boiling range distribution of petroleum distillates in boiling range from 174 to 700°C by gas chromatography
11. Report
11.1 Report the temperature to the nearest 0.5°C (1°F) at 1 % intervals between 1 and 99 % and at the IBP (0.5 %) and the FBP (99.5 %). Other report formats based upon users' needs may be employed.
NOTE 6 - If a plot of the boiling point distribution curve is desired, use graph paper with uniform subdivisions and use either retention time or temperature as the horizontal axis. The vertical axis will represent the sample boiling range distribution from 0 to 100 %. Plot each boiling point temperature against its corresponding accumulated percent slice area. Draw a smooth curve connecting the points.
12. Precision and Bias
12.1 Precision - The precision of this test method as determined by the statistical examination of the interlaboratory test results is as follows:
12.1.1 Repeatability - The differences 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 presented in Table 8 in only one case in twenty.
12.1.2 Reproducibility - The differences 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 presented in Table 8 in only one case in twenty.
12.2 Bias - Because the boiling point distribution can be defined only in terms of a test method, no bias for these procedures in Test Method D6352 for determining the boiling range distribution of heavy petroleum fractions by gas chromatography have been determined.
12.2.1 A rigorous, theoretical definition of the boiling range distribution of petroleum fractions is not possible due to the complexity of the mixture as well as the unquantifiable interactions among the components (for example, azeotropic behavior). Any other means used to define the distribution would require the use of a physical process, such as a conventional distillation or gas chromatographic characterization. This would therefore result in a method-dependent definition and would not constitute a true value from which bias can be calculated.
13. Keywords
13.1 boiling range distribution; distillation; gas chromatography; petroleum; petroleum distillate fractions; simulated distillation
