ASTM D5599 Standard Test Method for Determination of Oxygenates in Gasoline by Gas Chromatography and Oxygen Selective Flame Ionization Detection
14. Precision and Bias
14.1 Data obtained from a 10-laboratory round robin on the measurement of 13 oxygenates and total oxygen in 12 gasoline samples were examined. The precision of this test method as determined by a statistical examination of the interlaboratory test results based on 1,2-dimethoxyethane as the internal standard is as follows:
14.1.1 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 and in the normal and correct operation of the test method, exceed the following values only one case in twenty (see Table 3).
14.1.2 Reproducibility - The difference between two single and independent results obtained by different operators working in different laboratories on identical material would, in the long run, exceed the following values in only one case in twenty (see Table 3).
14.2 Bias - A statement of bias is currently being developed by the responsible study group.
15. Keywords
15.1 alcohols; DIPE (Di-iso-propylether); ETBE (ethyl tert-butylether); ethanol; gas chromatography; gasoline; methanol; MTBE (methyl tert-butylether); oxygenates; oxygen-selective detection; TAME (tert-amylmethylether)