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| Uncertainty Evaluation for the Determination of the Acid Number of Lubricant Oils by Potentiometric Titration |
| QIU Hui-rao,PANG Jin-shan |
| Guangzhou Mechanical Engineering Research Institute Co.LTD, Guangzhou, Guangdong 510530, China |
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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%.
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Received: 16 April 2018
Published: 01 September 2019
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2019, Vol. 40 
