17. Report
17.1 In the range from 0.05 to 5.00 mass % sulfur, report to the nearest 0.01 mass %. In the range from 5 to 30 mass % sulfur, report to the nearest 0.1 mass %.
18. Quality Control
18.1 Confirm the performance of the test procedure by analyzing a quality control sample that is stable and representative of the sample of interest.
18.1.1 When the quality control/quality assurance protocols are already established in the testing facility, these may be used to confirm the reliability of the test result.
18.1.2 When there is no quality control/quality assurance protocol established in the testing facility, Appendix X1 can be used for this purpose.
19. Precision and Bias
19.1 For Petroleum Products by Iodate and IR Methods - The precision of this test method as determined by statistical examination of interlaboratory results is as follows:
19.1.1 Repeatability - The difference between two 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 following values in only one case in twenty:
19.1.2 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 in only one case in twenty:
19.2 For Petroleum Cokes by Iodate and IR Methods - The precision of the test method as determined by statistical examination of interlaboratory results is as follows:
19.2.1 Repeatability - The difference between two 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 following values in only one case in twenty:
r = 0.05X
where X is the average of the two test results.
19.2.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical test material could, in the long run, in the normal and correct operation of the test method, exceed the following values in only one case in twenty:
R = 0.22X
where X is the average of the two test results.
19.3 Bias - The bias of the procedure in this test method is being determined.
20. Keywords
20.1 furnace; high temperature; induction furnace; iodate titration; IR detection; petroleum; resistance; sulfur; titration