1 適用范圍

本標準規(guī)定了測定固定污染源廢氣中苯系物的氣袋采樣/直接進樣-氣相色譜法。

本標準適用于固定污染源廢氣中的苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對二甲苯、異丙苯和苯乙烯的測定。

當進樣體積為 1.0ml時,苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對二甲苯、異丙苯和苯乙烯方法檢出限為 0.2~0.6mg/m³,測定下限為 0.4~2.4mg/m³,詳見附錄 A。

2 規(guī)范性引用文件

本標準引用了下列文件或其中的條款。凡是不注日期的引用文件,其有效版本適用于本標準。

GB/T 16157 固定污染源排氣中顆粒物測定與氣態(tài)污染物采樣方法

HJ 732 固定污染源廢氣 揮發(fā)性有機物的采樣

HJ/T 397 氣袋法固定源廢氣監(jiān)測技術規(guī)范

3 方法原理

用氣袋采集固定污染源廢氣中苯系物,取一定體積的樣品直接注入帶有氫火焰化檢測器 (FID)的氣相色譜儀中直接測定分析。根據(jù)保留時間定性,峰面積定量。

4 干擾和消除

樣品成分復雜時會對測定產生干擾,可以使用 GC/MS 定性確認。

5 試劑和材料

除非另有說明,分析時均使用符合國家標準的分析純試劑。

5.1 標準氣體:含有苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對二甲苯、異丙苯、苯乙烯待測化合物的有證標準氣體,且鋼瓶壓力輸出為10MPa。

5.2 標準物質:苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對二甲苯、異丙苯、苯乙烯,色譜純。

5.3 氮氣:純度≥99.99%。

5.4 氫氣:純度≥99.99%。

5.5 空氣:用凈化管凈化。

名稱：毛細管柱
固定液：聚乙二醇-20M
規(guī)格：30m*0.53mm*1.2um
型號：PEG-20M
應用：HJ 1261-2022 固定污染源廢氣 苯系物的測定 氣袋采樣直接進樣-氣相色譜法

固定污染源廢氣 苯系物的測定氣袋采樣 直接進樣毛細管柱 測試譜圖：

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: