摘要
介绍了甲醇气体标准样品的制备和定值方法,考察采用重量法制备氮气中甲醇标准气体样品的重现性、标准气体的均匀性和稳定性。试验表明,甲醇气体标准样品在气瓶内均匀性良好,在12个月研制期间没有不稳定趋势。摩尔分数为149.2×10-6甲醇气体标准样品,扩展不确定度为3%,能够满足环境污染源废气中甲醇气体监测的要求。
A methodology for developing the CRM of methanol in nitrogen was described in the paper. The reproducibly of the preparing method,the homogeneity and long-term stability of methanol standard gas were evaluated. The results indicated that standard gas was homogeneous and there are no systematic changes in concentrations of methanol in nitrogen were detected during 12 months monitoring period. The expand uncertainty is 3% at the mole fraction of 149.2 × 10^-6 for methanol in nitrogen. The CRM was intended for use in methanol monitoring of environment stationary source emission.
出处
《环境监测管理与技术》
2014年第2期52-55,共4页
The Administration and Technique of Environmental Monitoring
基金
国家环境保护标准制修订基金资助项目(2009541)
关键词
甲醇
气体标准样品
均匀性分析
稳定性分析
定值
不确定度分析
Methanol
Standard gas
Homogeneity analysis
Stability analysis
Certified value
Uncertain- ty analysis
