ASTM D5386 Test Method for Color of Liquids Using Tristimulus Colorimetry
12. Report
12.1 Report the following information:
12.1.1 Sample identification, and
12.1.2 Instrumental Pt-Co measurement to nearest whole unit.
13. Precision and Bias
13.1 Precision - The data for determining the precision of this test method are based on the analyses of o-xylene, styrene, and toluene at approximate values of 4, 8 and 12 respectively. Solutions prepared at levels of approximately 5, 10, 15 and 25 Pt-Co units were also included in the round robin.
13.2 Under the guidelines of Practice E 691, the following criteria should be used to judge the acceptability (95 % probability) of results obtained by this test method. The criteria were derived from a round robin between ten laboratories. Each one of the seven samples was run on two different days in each laboratory.
13.2.1 Intermediate Precision(formerly called Repeatability) - Two single test results obtained from the same laboratory should not be considered suspect unless they differ by more than 0.9 Pt-Co units.
13.2.2 Reproducibility - Two single test results obtained from different laboratories should not be considered suspect unless they differ by more than 2.0 Pt-Co units.
13.3 Bias - The bias of this test method cannot be determined because no referee method is available to determine the true value.
14. Keywords
14.1 color; hydrocarbons; platinum-cobalt; tristimulus
