In order to solve the problem that the dispersed degree of detection results for residual carbon in incoming inspections of diesel oil is high, the effects of constant weight operation on inspection data stabilization are explored by selecting such four key indexes as residual carbon, ash content, total pollutants and mechanical impurities with the control variate method in this study. The results showed that there were no obvious differences for the stabilization of two groups of data due to the mandatory constant weight in standard of detection of ash content; the relative standard deviations of detection results for residual carbon, total pollutants and mechanical impurities were increased to 5.3%, 8.7% and 7.9% respectively as well as dispersed degree of data was significantly increased without constant weight operation. In the detection of residual carbon for diesel oil, the uncertainty of weighing could be effectively reduced and system errors could be controlled by supplementing constant weight operation of empty sample tube so that the accuracy and repeatability of detection data in such situations as low residual carbon (≤0.1%) samples and proficiency testing could be improved. This study provides the references for quality control of detecting diesel oil in laboratory.

diesel oil  /  detection of residual carbon  /  constant weight operation  /  data stabilization  /  quality control of laboratory  /  system error