10. Precision and Bias
10.1 The following criteria should be used for judging the acceptability of results (95 % of confidence).
10.1.1 Repeatability - The difference between concurrent test 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 this test method, exceed the following values only in 1 case in 20:
where:
x = mean value (% remaining phenolic antioxidant).
10.1.2 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, and in the normal and correct operation of this test method, exceed the following values only in 1 case in 20:
where:
x = mean value (% remaining phenolic antioxidant).
11. Keywords
11.1 2,6-di-tert-butyl-4methylphenol; 2,6-di-tert-butylphenol; aromatic amines; hindered phenol antioxidant; in-service oils; linear sweep voltammetry; non-zinc turbine oils; turbine oil