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介绍了氮气中14种芳香烃混合气体标准样品的制备和定值方法。气体标样的组分是苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯、苯乙烯、氯苯、1,3,5-三甲苯、1,2,4-三甲苯、1,4-二氯苯、1,3-二氯苯、1,2-二氯苯、1,2,4-三氯苯,浓度水平为1μmol/mol。通过制备重现性、浓度线性关系、均匀性和稳定性的考察,气体标样在气瓶内均匀性良好,扩展相对不确定度分别为3%~7%。
The preparation and calibration methods of 14 kinds of aromatic hydrocarbon mixed gas standard samples in nitrogen were introduced. Components of the gas standard are benzene, toluene, ethylbenzene, paraxylene, metaxylene, orthoxylene, styrene, chlorobenzene, mesitylene, 1,2,4-trimethylbenzene, 1,4-dichlorobenzene, 1,3-dichlorobenzene, 1,2-dichlorobenzene and 1,2,4-trichlorobenzene at a concentration level of 1 μmol / mol. Through the preparation reproducibility, concentration linearity, uniformity and stability of the study, gas samples in the cylinder uniformity, expansion of the relative uncertainty of 3% to 7%.