ASTM D1266 Test Method for Sulfur in Petroleum Products (Lamp Method)
13. Report
13.1 Report the results of the test to the nearest 0.01 % for sulfur at a level of 0.05 % and higher, and the specific test procedure used.
14. Quality Control
14.1 Confirm the performance of the apparatus or the procedure, or both, each day it is in use by analyzing a QC sample (6.10) that is representative of samples typically analyzed. Increase the analysis frequency of the QC sample if a large number of samples are analyzed. Analysis of the result(s) from the QC sample(s) can be carried out using control charts, or other statistically equivalent techniques, to ascertain the control status of the total testing process. Any out of control data should trigger investigation for root cause. The QC sample precision shall be checked against the ASTM method precision to ensure data quality.
15. Precision and Bias
15.1 The precision of this test is not known to have been obtained in accordance with currently accepted guidelines (for example, in Committee D-2 Research Report RR-D-2-1007, "Manual on Determining Precision Data for ASTM Methods on Petroleum Products and Lubricants").
15.1.1 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 only in one case in twenty:
Repeatability: 0.005
15.1.2 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:
Reproducibility: 0.010 + 0.025S
where:
S = the total sulfur content, mass percent, of the sample.
15.2 Bias - It is not practicable to specify bias of Test Method D1226 for measuring sulfur becuase the responsible subcommittee, after diligent search, was unable to attract volunteers for an interlaboratory study.
16. Keywords
16.1 lamp; sulfur
