ASTM D2318 Test Method for Quinoline-Insoluble (QI) Content of Tar and Pitch
14. Report
14.1 Report the QI content to the nearest 0.1 %.
15. Precision and Bias
15.1 The following criteria shall be used for judging the acceptability of results (95 % probability):
15.1.1 Repeatability - Duplicate values by the same operator shall not be considered suspect unless the determined percentages differ by more than 0.2 when the QI content is 4 % or less, or by more than 0.3 when the QI content is more than 4 %.
15.1.2 Reproducibility - The values reported by each of two laboratories, representing the arithmetic average of duplicate determinations, shall not be considered suspect unless the reported percentages differ by more than 0.3 when the QI content is 4 % or less, or by more than 0.6 when the QI content is more than 4 %.
15.2 Bias - This test method has no bias because the value of quinoline-insouble is defined in terms of this test method.
15.3 Relative Bias - "t-test" performed on the QI results by this test method and those obtained by Test Method D7280 using a stainless steel crucible did not indicate any statistically significant difference at 95 % confidence level.
16. Keywords
16.1 coal-tar insolubles; pitch; QI; quinoline insolubles; tar
