聚乙二醇-20M--HJ 1261—2022 固定污染源废气 苯系物的测定气袋采样 直接进样毛细管柱

1 适用范围

本标准规定了测定固定污染源废气中苯系物的气袋采样/直接进样-气相色谱法。

本标准适用于固定污染源废气中的苯、甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、异丙苯和苯乙烯的测定。

当进样体积为 1.0ml时,苯、甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、异丙苯和苯乙烯方法检出限为 0.2~0.6mg/m³,测定下限为 0.4~2.4mg/m³,详见附录 A。

2 规范性引用文件

本标准引用了下列文件或其中的条款。凡是不注日期的引用文件,其有效版本适用于本标准。

GB/T 16157 固定污染源排气中颗粒物测定与气态污染物采样方法

HJ 732 固定污染源废气 挥发性有机物的采样

HJ/T 397 气袋法固定源废气监测技术规范

3 方法原理

用气袋采集固定污染源废气中苯系物,取一定体积的样品直接注入带有氢火焰化检测器 (FID)的气相色谱仪中直接测定分析。根据保留时间定性,峰面积定量。

4 干扰和消除

样品成分复杂时会对测定产生干扰,可以使用 GC/MS 定性确认。

5 试剂和材料

除非另有说明,分析时均使用符合国家标准的分析纯试剂。

5.1 标准气体:含有苯、甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、异丙苯、苯乙烯待测化合物的有证标准气体,且钢瓶压力输出为10MPa。

5.2 标准物质:苯、甲苯、乙苯、邻二甲苯、间二甲苯、对二甲苯、异丙苯、苯乙烯,色谱纯。

5.3 氮气:纯度≥99.99%。

5.4 氢气:纯度≥99.99%。

5.5 空气:用净化管净化。

名称：毛细管柱
固定液：聚乙二醇-20M
规格：30m*0.53mm*1.2um
型号：PEG-20M
应用：HJ 1261-2022 固定污染源废气 苯系物的测定 气袋采样直接进样-气相色谱法

固定污染源废气 苯系物的测定气袋采样 直接进样毛细管柱 测试谱图：

Determination of benzene homologues in waste gas from fixed pollution sources Direct injection capillary column for bag sampling

Determination of benzene homologues in waste gas from fixed pollution sources Details of gas bag sampling direct injection capillary column:





Determination of benzene homologues in waste gas from fixed pollution sources Direct injection of gas bag sampling - gas chromatography (draft for comment)

1 Scope of application



This standard specifies the gas bag sampling/direct injection - gas chromatography method for the determination of benzene homologues in waste gas from fixed pollution sources.



This standard is applicable to the determination of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene in waste gas from fixed pollution sources.



When the injection volume is 1.0ml, the detection limit of benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene is 0.2~0.6mg/m3, and the lower limit of determination is 0.4~2.4mg/m3. See Appendix A for details.



2 Normative references



This standard refers to the following documents or clauses therein. For undated reference documents, the effective version is applicable to this standard.



GB/T 16157 Determination of Particulate Matter in Exhaust Gas from Stationary Sources and Sampling Method for Gaseous Pollutants



HJ 732 Sampling of volatile organic compounds in exhaust gas from fixed pollution sources



HJ/T 397 Technical Specification for Stationary Source Waste Gas Monitoring by Air Bag Method



3 Method principle



Use air bag to collect benzene series in waste gas of fixed pollution source, take a certain volume of sample and directly inject it into gas chromatograph with hydrogen flame detector (FID) for direct determination and analysis. Qualitative and quantitative peak area according to retention time.



4 Interference and elimination



If the sample composition is complex, it will interfere with the determination, so GC/MS can be used for qualitative /confirm/iation.



5 Reagents and materials



Unless otherwise specified, analytical reagents meeting national standards shall be used for analysis.



5.1 Standard gas: certified standard gas containing benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene and styrene compounds to be tested, and the cylinder pressure output is guaranteed to be 10 MPa.



5.2 Reference materials: benzene, toluene, ethylbenzene, o-xylene, m-xylene, p-xylene, cumene, styrene, chromatographically pure.



5.3 Nitrogen: purity ≥ 99.99%.



5.4 Hydrogen: purity ≥ 99.99%.



5.5 Air: purified by purification pipe.





Name: capillary column

Fixing solution: polyethylene glycol - 20M

Specification: 30m * 0.53mm * 1.2um

Model: PEG-20M

Application: HJ 1261-2022 Determination of benzene homologues in waste gas from fixed pollution sources Direct injection of gas bag sampling - gas chromatography








Determination of benzene homologues in waste gas from fixed pollution sources Gas bag sampling Direct injection capillary column test spectrogram: