石油馏分中碱性氮含量测定的不确定度评估  

Uncertainty Assessment for the Determination of Alkaline Nitrogen Content in Petroleum Fractions

作　　者：刘嘉琪 张会成 高波 王家兴 陈益民 LIU Jia-qi;ZHANG Hui-cheng;GAO Bo;WANG Jia-xing;CHEN Yi-min(National Paraffin Quality Supervision and Inspection Center,Sinopec(Dalian)Research Institute of Petroleum and Petrochemicals Co.,Ltd.,Dalian Liaoning 116045,China)

机构地区：[1]中石化(大连)石油化工研究院有限公司,国家石蜡质量检验检测中心,辽宁大连116045

出　　处：《当代化工》2023年第3期609-612,617,共5页Contemporary Chemical Industry

摘　　要：使用电位滴定法测定了石油馏分中碱性氮的含量,详细分析了实验过程中影响碱性氮含量测量的各不确定度分量,具体包括标准滴定溶液浓度、测量重复性偏差、天平称重过程以及自动电位滴定仪引入的不确定度分量,研究计算这4个分量的具体不确定度数值并合成得到0.67%的总合成标准不确定度。取95%的置信概率,计算得到测定的石油馏分中碱性氮含量的扩展不确定度为1.35%,满足了碱性氮含量测定的不确定度要求。The potentiometric titration method was used to determine the content of alkaline nitrogen in petroleum fractions.And various uncertainties affecting the measurement of alkaline nitrogen in petroleum fractions during the experiment were analyzed in detail,including the concentration of the standard titration solution,the measurement repeatability deviation,the weighing process of the balance and the automatic potentiometric titrator.The corresponding uncertainty values were calculated and finally the synthetic standard uncertainty was determined to be 0.67%.At the confidence probability of 95%,the extended uncertainty of 1.35%for the determination of alkaline nitrogen in petroleum fractions met the uncertainty requirement for the determination of alkaline nitrogen content.

关 键 词：计量学 石油馏分 碱性氮 电位滴定法 不确定度评估 

分 类 号：TB99[一般工业技术—计量学]