温度滴定法快速测定航空油品酸值

应用温度滴定技术快速测定航空油品酸值。在航空油品中加入一种温度滴定指示剂，根据滴定过程体系温度 滴定体积曲线得到滴定终点，计算得到样品酸值。测定结果通过苯甲酸进行可靠性和准确性验证。结果表明，用温度滴定法测定不同浓度的苯甲酸的结果重现性非常好，回归分析显示R为0.99965（n=5），方差P<0.0001。该方法整个测定过程只需3～5 min，对润滑油、液压油、汽油、煤油、柴油都具有很好的适用性，解决了电位滴定法、颜色指示剂法在测定深色或加有添加剂的石油产品酸值时滴定终点难以判断的问题。

Rapid Determination for Acidity of Aviation Oils by Thermometric Titration

The acidity of aviation oils was quickly determined by thermometric titration technique. By adding a kind of thermometric titration indicator in aviation oil sample to indicate the temperature changes during the titration, the titration curve of temperature-titration volume could be drawn and then the acidity value of the sample was obtained. The reliability and accuracy of the results were verified by the benzoic acid with different concentrations which showed very good repeatability with the regression analysis R of 0.99965 (n=5) and the variance of P lower than 0.0001. The whole measuring process of thermometric titration lasted only 3-5 min. This method provided a good way to determine acidity of colored or additive-containing petroleum oils, such as lubrication oil, hydraulic oil，gasoline, kerosene and diesel, which resolved efficiently the problem of endpoint determination in potentiometric titration and color indicator titration.