ASTM D3710 for Boiling Range Distribution of Gasoline and Gasoline Fractions
ASTM D3710 Standard Test Method for Boiling Range Distribution of Gasoline and Gasoline Fractions by Gas Chromatography
12. Report
12.1 Report the temperature to the nearest 1°F (0.5°C) at 1 % intervals between 1 and 99 %, and at 0.5 % and 99.5 %. The report format is shown in Table 3. Other formats based on users' needs may also be employed.
12.2 Report volume percent of isopentane and lighter compounds individually. This provides a more absolute basis for describing commercial gasolines than the IBP.
NOTE 21 - Some olefins will be measured with butane and isopentane. See 11.3.4.
13. Precision and Bias
13.1 The precision of this test method depends upon the shape of the boiling range distribution curve. Both the repeatability and reproducibility vary with percent recovered and the rate of change of temperature with percent recovered:
dT/dV
where:
T = temperature, and
V = percent recovered.
The slopes, dT/dV, are computed from points adjacent to the selected percent recovered points, for example, for 60 %, the temperatures at 58, 59, 61, and 62 %.
13.2 The following criteria should be used for judging acceptability of results. These data were generated from cooperative analyses of gasolines with a wide range of volatilities.
13.2.1 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 4 only in one case in twenty.
13.2.2 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 5 only in one case in twenty.
13.3 Bias - Bias cannot be determined since there is no acceptable reference material suitable for determining the bias for the procedure in this test method.
14. Keywords
14.1 boiling range distribution; gas chromatography; gasoline; gasoline blending component
