Abstract：Acid number in lubricating oil was measured by potentiometric titration. Establishing evaluation mathematical model of uncertainty of acid number test results to analyze the sources of uncertainty, the test results were evaluated. The acid number of the Mobil gear oil by potentiometric titration is 0.706 mg/g through repeated experiment. Type A and type B uncertainties of the result were evaluated,it showed that expanded uncertainty is 0.010 mg/g when coverage factor is k=2 and level of confidence is 95%.
丘晖饶,庞晋山. 电位滴定法测定润滑油酸值不确定度评估[J]. 计量学报, 2019, 40(5): 937-940.
QIU Hui-rao,PANG Jin-shan. Uncertainty Evaluation for the Determination of the Acid Number of Lubricant Oils by Potentiometric Titration. Acta Metrologica Sinica, 2019, 40(5): 937-940.
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2019, Vol. 40 
