57种臭氧前体有机物混合标准气体量值比对研究

The Property Value Comparison of Gas Reference Materials of 57 Ozone Precursors

标准物质的量值准确性是监测数据准确的重要前提。为科学评价57种臭氧前体有机物混合标准气体量值的准确性,研究建立了定量环进样-中心切割-气相色谱-双火焰离子化检测器分析方法与量值比对方法(E_(n)值法),并对市售6个品牌各2个批次标准气体开展量值比对研究。研究结果表明,4个品牌标气量值一致性、准确性较好,2个品牌存在5~22种组分量值偏离(E_(n)绝对值为1.0~5.3),用于开展臭氧前体有机物监测的标准物质质量仍需持续监督、提升。

The accuracy of the value of the reference material is an important prerequisite for the accuracy of the monitoring data.In order to scientifically evaluate the accuracy of the property value of commercial gas reference materials of 57 ozone precursors,an analysis and comparison method of E_(n) value and gas chromatography equipped with loop,Deans Switch and double FID was established.Based on this method,the consensus of 6 brands of gas reference materials containing 57 ozone precursors(PAMHC)was evaluated.Among the 6 brands,4 brands showed good consensus and accuracy,2 brands showed a significant deviation in 5-22 compounds(absolute E_(n) value ranged 1.0 to 5.3).This result indicated it should pay more attention to the quality of PAMHC gas reference materials in ozone precursors monitoring.