ASTM D7213 Test Method for Boiling Range Distribution of Petroleum Distillates
ASTM D7213 Standard Test Method for Boiling Range Distribution of Petroleum Distillates in the Boiling Range from 100 to 615°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 5 - 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 - A temporary repeatability statement is found in Table 4, which was derived from a robustness study conducted in 2004 using four samples and four laboratories. An interlaboratory study in accordance with Practice D6300 is underway to estimate permanent precision for this test method.
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 D7213 for determining the boiling range distribution of light and middle 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 amount the components (for example, azeotropic behavior). Any other means used to define the distribution would require the use of a physical process, such as conventional physical 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; simulated distillation
