ASTM D3703 Test Method for Peroxide Number of Aviation Turbine Fuels
10. Precision and Bias
10.1 Precision - The precision of this test method, reported in 10.1.1, was originally determined by dissolving the sample in carbon tetrachloride. The precision when using 1,1,2-trichloro 1,2,2-trifluoroethane has been shown to match that of the original work and is reported in CRC Report No. 559.
NOTE 2 - Prior to 1983, the test method called for the use of carbon tetrachloride and the precision was determined with carbon tetrachloride as the sample solvent. It has become the policy of most laboratories to avoid the use of carbon tetrachloride wherever possible because it is a carcinogen. 1,1,2-trichloro-1,2,2-trifluoroethane should now be used as per the procedure in Section 8 of this test method.
10.1.1 Repeatability - The difference between two successive 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:
r = 0.15X
where:
X = the average of two test results.
10.1.2 Reproducibility - The reproducibility of the test method has not been determined because of the difficulty encountered in maintaining sample integrity when distributing them to cooperative laboratories. Further work is being undertaken to come up with an acceptable reproducibility statement.
10.2 Bias - Since there is no accepted reference material suitable for determining the bias for this test method measuring the peroxide number of aviation turbines fuels, no statement on bias is being made.
11. Keywords
11.1 peroxide number
