ASTM D4046 Test Method for Alkyl Nitrate in Diesel Fuels by Spectrophotometry
10. Precision and Bias
10.1 The precision of this test method as obtained by statistical examination of interlaboratory test results is as follows:
10.1.1 Repeatability - The difference between 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 this test method, exceed the following values only in one case in twenty:
0.017 vol %
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, in the normal and correct operation of this test method, exceed the following values only in one case in twenty:
0.036 vol %
10.2 Bias - The bias of this test method cannot be determined since an appropriate standard reference material containing a known level of alkyl nitrate in diesel fuel is not available.
11. Keywords
11.1 alkyl nitrate; diesel fuel; nitroxylanol; spectrophotometry
