二苯并噻吩硫元素含量标准物质的研制  

Development of Reference Materials for Sulfur Contents of Dibenzothiophene

作　　者：王海峰[1] 李佳[1] 孙国华[1] 苗雨 WANG Haifeng;LI Jia;SUN Guohua;MIAO Yu(National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院,北京100029

出　　处：《计量科学与技术》2022年第4期108-113,共6页Metrology Science and Technology

基　　金：国家市场监督管理总局科技计划项目(2021MK150);国家市场监督管理总局能力提升项目(31-ANL1814)。

摘　　要：固体和液体燃料的硫元素含量测定,缺乏量值准确可靠的有机纯物质硫元素含量标准物质,不能满足量值溯源的需求。研制了二苯并噻吩硫元素含量标准物质(GBW 06204),采用国际上先进的有机纯物质元素含量定值方法,即根据各组分含量及其分子中待测元素含量,计算得到标准物质的元素含量认定值。其中,有机杂质含量采用了气相色谱-质谱法和差示扫描量热法两种方法联合定值;水分采用卡尔·费休库仑法定值;无机杂质采用灼烧残渣称重法定值。标准物质的特性量值溯源至纯物质质量和温度等SI单位以及原子量上,标准物质的硫元素含量的认定值17.403%,不确定度(U)为0.005%,达到了国际先进水平。该标准物质适用于杜马斯法等有机元素分析仪的校准,可用于油品硫含量标准物质的配制,有利于保障燃料硫元素含量的量值准确可靠。Measurement of sulfur content of solid and liquid fuels is restricted by the lack of certified reference material(CRM)of organic pure substance for sulfur,which can not meet the demand for traceability.In this paper,the CRM of dibenzothiophene for sulfur content labeled as GBW 06204 was developed,and an internationally advanced method for determining the elemental content of organic pure substances was adopted,that is,based on the content of each component and its molecular content of the element to be measured,the elemental content of the standard substance was calculated to obtain the determined value.Among them,the organic impurity content was determined by using gas chromatographyspectrometry and differential scanning calorimetry.The water content was determined by Karl Fischer coulometric titration.The inorganic impurity content was determined by the residue on ignition.The certified value of CRM was traceable to the mass of pure substances,temperature,and atomic weight.The certified sulfur content of CRM was 17.403%with an uncertainty(U)of 0.005%,which has reached the international advanced level.This CRM is suitable for the calibration of elemental analyzers such as the Dumas method,and the preparation of CRM of petroleum for sulfur content,which is helpful for the accuracy and reliability of sulfur content results of fuels.

关 键 词：有机元素含量 二苯并噻吩 硫 标准物质 不确定度 

分 类 号：TQ421.31[化学工程] O626.12[理学—有机化学]