两种方法测定总硫含量结果的不确定度评定

Uncertainty evaluation of total sulfur content determination results by two methods

关键词:  天然气  总硫测定  氧化微库仑法  紫外荧光法  不确定度评定  不确定度来源  精密度评价

Key words:  natural gas  total sulfur determination  oxidative microcoulometry  ultraviolet fluorescence  uncertainty evaluation  uncertainty source  precision evaluation

摘要:

工业上测定气体中总硫含量的方法甚多,但在油气加工工业中应用较多的是氧化微库仑法和紫外荧光法。由于氧化微库仑法是可以直接溯源至SI制的基准方法,其测量不确定度明显优于属于标准方法的紫外荧光法,故建议采用氧化微库仑法作为仲裁方法。相对于氧化微库仑法,紫外荧光法的操作较简便,分析速度较快,且不使用有毒的电解液,具有环保优势,因而宜作为例行分析方法推广应用。 

Abstract:

There are several methods of determining total sulfur content of gas in industry, but the most commonly used methods for oil and gas industry are oxidative microcoulometry (OM) and ultraviolet fluorescence (UF). Since the OM can directly trace to SI system unit, its measurement uncertainty is obviously better than that of UF. Therefore, it is suggested that the OM should be a arbitration method (PMM) for total sulfur content determination. Compared with OM, there are simple operation, faster speed of analysis and environmental advantages for UF, and this method could be a better routine analysis.