ASTM D611 standard test methods for aniline point and mixed aniline point of petroleum products and hydrocarbon solvents
11. Report
11.1 If the range of three successive observations of the aniline point temperature is not greater than 0.1°C (0.2°F) for light-colored samples or 0.2°C (0.4°F) for dark samples, report the average temperature of these observations, corrected for thermometer calibration errors, to the nearest 0.05°C (0.1°F) as the aniline point.
11.2 If such a range is not obtained after five observations, repeat the test using fresh quantities of aniline and sample in a clean, dry apparatus, and if consecutive temperature observations show a progressive change, or if the range of observations is greater than the repeatability given in 12.1, report the test method as being inapplicable.
12. Precision and Bias
12.1 The precision of these test methods as obtained by statistical examination of interlaboratory test results is as follows:
12.1.1 Repeatability - The difference between successive test results (two average temperatures obtained in a series of observations as described in Section 11 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 only in one case in twenty:
Not determined from recent cooperative tests; however, the ratios with those given in the 1953 version are believed to apply.
12.1.2 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 only in one case in twenty:
Not determined from recent cooperative tests; however, the ratios with those given in the 1953 version are believed to apply.
12.2 Bias - A statement of bias is now being developed by the subcommittee.
12.3 The precision of this test was not obtained in accordance with Committee D02 Research Report RR:D02-1007, "Manual on Determining Precision Data for ASTM Methods on Petroleum Products and Lubricants".
13. Keywords
13.1 aniline point; aromatics; mixed aniline point