紫外荧光法测定汽/柴油中总硫含量不确定度的评定

Evaluation of Uncertainty in Determination of Total Sulfur in Gasoline/Diesel by Ultraviolet Fluorescence

GB/T 34100-2017《轻质烃及发动机燃料和其他油品中总硫含量的测定-紫外荧光法》适用于测定汽油、含氧汽油、柴油、生物柴油等发动机燃料的总硫含量[1],测定范围为1.0～8000 mg/kg。本文介绍采用GB/T34100-2017直接进样系统测定汽/柴油中硫含量不确定度,选取车用柴油作为实验样品,从试验原理评定了不确定度的来源,对各个不确定度进行了评定,并计算了扩展不确定度。当试样的硫含量为5.2394 mg/kg时,其扩展不确定度为0.2724 mg/kg(k=2)。

GB/T34100-2017《Standard Test Method for Determination of Total Sulfur in Light Hydrocarbons, Spark Ignition Engine Fuel, Diesel Engine Fuel,and Engine Oil by Ultraviolet Fluorescence》 is applicable to engine fuel such as gasoline, oxygen enriched gasoline diesel, biodiesel and so on. Samples containing1.0 mg/kg to 8000 mg/kg total sulfur can be analyzed. This article describes GB/T34100-2017 direct injection system to determine the uncertainty of total sulfur in gasoline/diesel. Selected a diesel as sample,the sources of uncertainty were evaluated from the experimental principle. Calculated each uncertainty and expanded uncertainty. When the total sulfur in diesel is 5.2394 mg/kg, the expanded uncertainty is 0.2724 mg/kg(k=2).