ASTM D3524 Diesel Fuel Diluent in Used Diesel Engine Oils
ASTM D3524 Standard Test Method for Diesel Fuel Diluent in Used Diesel Engine Oils by Gas Chromatography
11. Calculation
11.1 Record the total areas due to the fuel portion of the sample and the area due to decane as described in 9.1 and determine the ratio, R, as described in 9.2.
11.2 Determine the weight percent (mass percent) of diesel fuel of the samples by relating the R values obtained to the previously determined calibration curve. Report the results to nearest 0.1 %.
12. Precision and Bias
12.1 The following criteria should be used for judging the acceptability of results (95 % probability):
12.1.1 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 the following value only in one case in twenty:
0.3 weight (mass %)
12.1.2 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 the following value only one case in twenty:
1.6 weight (mass %)
NOTE 7 - The above precision is based on the use of electronic integrators to measure areas and may not be indicative when other means of measurement are used.
NOTE 8 - This precision statement applies only to SAE 30 oils.
12.2 Bias - No estimate of the bias of this test method is possible because of the empirical nature of this test method.
13. Keywords
13.1 diesel fuel; fuel dilution; gas chromatography; lubricating oil
