1 適用范圍

本標(biāo)準(zhǔn)規(guī)定了測(cè)定固定污染源廢氣中苯系物的氣袋采樣/直接進(jìn)樣-氣相色譜法。

本標(biāo)準(zhǔn)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(duì)二甲苯、異丙苯和苯乙烯的測(cè)定。

當(dāng)進(jìn)樣體積為 1.0ml時(shí),苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對(duì)二甲苯、異丙苯和苯乙烯方法檢出限為 0.2~0.6mg/m³,測(cè)定下限為 0.4~2.4mg/m³,詳見(jiàn)附錄 A。

2 規(guī)范性引用文件

本標(biāo)準(zhǔn)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(biāo)準(zhǔn)。

GB/T 16157 固定污染源排氣中顆粒物測(cè)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(jī)物的采樣

HJ/T 397 氣袋法固定源廢氣監(jiān)測(cè)技術(shù)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(cè)器 (FID)的氣相色譜儀中直接測(cè)定分析。根據(jù)保留時(shí)間定性,峰面積定量。

4 干擾和消除

樣品成分復(fù)雜時(shí)會(huì)對(duì)測(cè)定產(chǎn)生干擾,可以使用 GC/MS 定性確認(rèn)。

5 試劑和材料

除非另有說(shuō)明,分析時(shí)均使用符合國(guó)家標(biāo)準(zhǔn)的分析純?cè)噭?

5.1 標(biāo)準(zhǔn)氣體:含有苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對(duì)二甲苯、異丙苯、苯乙烯待測(cè)化合物的有證標(biāo)準(zhǔn)氣體,且鋼瓶壓力輸出為10MPa。

5.2 標(biāo)準(zhǔn)物質(zhì):苯、甲苯、乙苯、鄰二甲苯、間二甲苯、對(duì)二甲苯、異丙苯、苯乙烯,色譜純。

5.3 氮?dú)?純度≥99.99%。

5.4 氫氣:純度≥99.99%。

5.5 空氣:用凈化管凈化。

固定污染源廢氣苯系物測(cè)定 圖片：



Determination of benzene series in stationary pollution source waste gas
Determination of benzene series in waste gas from stationary pollution source Details:

Fixed pollution source waste gas Determination of benzene series Air bag sampling Direct injection-gas chromatography (draft for comments)
1 Scope of application

This standard specifies the air bag sampling/direct injection-gas chromatography method for the determination of benzene series in waste gas from stationary 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 stationary 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 quotes the following documents or their clauses. For undated reference documents, their valid versions apply to this standard.

GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method for gaseous pollutants

HJ 732 Sampling of volatile organic compounds from stationary pollution sources

HJ/T 397 Airbag method fixed source exhaust gas monitoring technical specifications

3 Principles of the method

Use an air bag to collect the benzene series in the exhaust gas of a fixed pollution source, and take a certain volume of sample directly into a gas chromatograph with a hydrogen flame detector (FID) for direct measurement and analysis. Qualitative based on retention time and quantitative peak area.

4 Interference and elimination

Complicated sample composition will interfere with the determination, which can be qualitatively confirmed by GC/MS.

5 Reagents and materials

Unless otherwise specified, analytical reagents that meet national standards are used for analysis.

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

5.2 Standard 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: Purify with a purification tube.

Determination of benzene series in waste gas from stationary sources