环境监测用正己烷气体标准样品的研制  

Preparation of n-hexane standard gas for environmental monitoring

作　　者：杜健[1,2] 王帅斌 王倩[1,2] 樊强 李宁[1,2] 

机构地区：[1]环境保护部标准样品研究所,北京100029 [2]国家环境保护污染物计量和标准样品研究重点实验室,北京100029

出　　处：《化工环保》2017年第6期713-718,共6页Environmental Protection of Chemical Industry

摘　　要：采用称量法通过两步稀释制备了含量水平为1μmol/mol的氮气中正己烷气体标准样品,考察了气瓶内壁吸附作用、制备重现性、瓶内均匀性、时间稳定性等相关因素的影响,并将该正己烷气体标准样品与同类气体标准样品进行了比较。结果表明:该正己烷气体标准样品的最低使用压力为1 MPa,有效期为12个月(0~38℃),相对扩展不确定度(k=2)为2%;该正己烷气体标准样品的量值与同类标准样品具有可比性,可为相关环境监测工作提供技术支持。The n-hexane standard gas with 1 μmol/mol of concentration level was prepared in nitrogen by gravimetric method and two-step dilution process. The affecting factors were investigated, such as： the adsorbability of the cylinder inner wall, the reproducibility of the preparation process, the uniformity and time stability of gas in the cylinder. Moreover, the n-hexane standard gas was compared with other same type standard sample. The result showed that： The minimum using pressure was 1 MPa, the valid term was 12 months （at 0-38 ℃ ） and the relative expanded uncertainty （k=2） was 2% for the n-hexane standard gas; The value of the n-hexane standard gas was comparable to the same type standard sample, which could provide technical support for environmental monitoring.

关 键 词：正己烷 气体标准样品 环境监测 不确定度 

分 类 号：X830.5[环境科学与工程—环境工程]