ASTM D6374 Standard Test Method for Volatile Matter in Green Petroleum Coke Quartz Crucible Procedure
12. Report
12.1 Report to one decimal the average of duplicate determinations that agree within 0.5 %. When this agreement is not met, the values are considered suspect and another duplicate set shall be run. Report the average of all results agreeing within 0.5 %. If the second set also fails to agree within 0.5 %, report the average of all four values.
13. Precision and Bias
13.1 Precision - The precision of this test method as determined by the statistical examination of the interlaboratory test results is as follows:
13.2 Repeatability - The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions on identical test materials would, in the long run, in the normal and correct operation of the test method, exceed the following values only one case in twenty.
Repeatability = 0.01905 x (X + 2.826)
where: X is the average of two results in weight percent.
13.3 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical material will, in the long run, in normal and correct operation of the test method, exceed the following values only in one case in twenty.
Reproducibility = 0.06662 x (X + 2.826)
where: X is the average of two results in weight percent.
13.4 Bias - Since there is no accepted reference material for determining the bias for this test method for measuring the volatile matter in green petroleum coke, no statement on bias is being made.
14. Keywords
14.1 analysis time; green petroleum coke; volatile matter
