ASTM D2269 Test Method for Evaluation of White Mineral Oils by Ultraviolet Absorption
10. Report
10.1 Report the difference between the absorbance of the mineral oil extract and the solvent control at the wavelength desired.
NOTE 6 - Calculations can be found in U.S. Pharmacopeia (USP XXIII)/National Formulary (NF XVIII).
11. Precision and Bias
11.1 The precision of this test method as obtained by statistical examination of interlaboratory test results is as follows:
11.1.1 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 the test method, exceed 0.014 absorbance units only in one case in twenty.
11.1.2 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 0.044 absorbance units only in one case in twenty.
11.1.3 These precision data were obtained on absorbances in the wavelength region 275 to 280 nm.
11.2 Bias - This procedure has no bias because the value of absorbance can be defined only in terms of a test method.
12. Keywords
12.1 ultraviolet spectroscopy; white mineral oil
