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環(huán)境空氣甲烷的測(cè)定HJ 604-2017
環(huán)境空氣甲烷的測(cè)定HJ 604-2017 詳細(xì)信息：

甲烷毛細(xì)管柱：

固定相：多孔層開(kāi)口管分子篩柱或其他等效毛細(xì)管柱

規(guī)格：30m*0.53mm*25um

應(yīng)用： 環(huán)境空氣 總烴、甲烷和非甲烷總烴的測(cè)定 直接進(jìn)樣-氣相色譜法HJ 604-2017


HJ 604-2017 環(huán)境空氣 總烴、甲烷和非甲烷總烴的測(cè)定 直接進(jìn)樣-氣相色譜法
1 適用范圍
      本標(biāo)準(zhǔn)規(guī)定了測(cè)定環(huán)境空氣中總烴、甲烷和非甲烷總烴的直接進(jìn)樣-氣相色譜法。
      本標(biāo)準(zhǔn)適用于環(huán)境空氣中總烴、甲烷和非甲烷總烴的測(cè)定，也適用于污染源無(wú)組織排放監(jiān)控點(diǎn)空氣中總烴、甲烷和非甲烷總烴的測(cè)定。

當(dāng)進(jìn)樣體積為1.0ml時(shí)，本標(biāo)準(zhǔn)測(cè)定總烴、甲烷的檢出限均為0.06mg/m3（以甲烷計(jì)）, 測(cè)定下限均為0.24 mg/m3（以甲烷計(jì)）；非甲烷總烴的檢出限為0.07mg/m3（以碳計(jì)），測(cè)定下限為0.28 mg/m3（以碳計(jì)）。

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)。
      HJ 194 環(huán)境空氣質(zhì)量手工監(jiān)測(cè)技術(shù)規(guī)范
      HJ 664 環(huán)境空氣質(zhì)量監(jiān)測(cè)點(diǎn)位布設(shè)技術(shù)規(guī)范（試行）
      HJ 732 固定污染源廢氣揮發(fā)性有機(jī)物的采樣氣袋法
      HJ/T 55 大氣污染物無(wú)組織排放監(jiān)測(cè)技術(shù)導(dǎo)則

3 術(shù)語(yǔ)和定義

      下列術(shù)語(yǔ)和定義適用于本標(biāo)準(zhǔn)。

3. 1

      總烴 total hydrocarbons (THC)

指在本標(biāo)準(zhǔn)規(guī)定的測(cè)定條件下，在氣相色譜儀的氫火焰離子化檢測(cè)器上有響應(yīng)的氣態(tài)有機(jī)化合物的總和。

3.2

      非甲烷總烴 nonmethane hydrocarbons (NMHC)

指在本標(biāo)準(zhǔn)規(guī)定的測(cè)定條件下，從總烴中扣除甲烷以后其他氣態(tài)有機(jī)化合物的總和（除非另有說(shuō)明，結(jié)果以碳計(jì)）。

4 方法原理

將氣體樣品直接注入具氫火焰離子化檢測(cè)器的氣相色譜儀，分別在總烴柱和甲烷柱上測(cè)定總烴和甲烷的含量，兩者之差即為非甲烷總烴的含量。

環(huán)境空氣甲烷的測(cè)定HJ 604-2017  測(cè)試譜圖：




Determination of ambient air methane HJ 604-2017
Determination of ambient air methane HJ 604-2017 Details:

Methane capillary column:

Stationary phase: Porous layer open tube molecular sieve column or other equivalent capillary column

Specifications: 30m*0.53mm*25um

Application: Ambient Air Determination of Total Hydrocarbons, Methane and Non-Methane Total Hydrocarbons Direct Injection-Gas Chromatography HJ 604-2017


HJ 604-2017 Ambient Air Determination of Total Hydrocarbons, Methane and Non-Methane Total Hydrocarbons Direct Injection-Gas Chromatography
1 Scope of application
      This standard specifies the direct injection-gas chromatography method for the determination of total hydrocarbons, methane and non-methane total hydrocarbons in ambient air.
      This standard applies to the determination of total hydrocarbons, methane and non-methane total hydrocarbons in ambient air, and also applies to the determination of total hydrocarbons, methane and non-methane total hydrocarbons in the air at monitoring points of fugitive emissions from pollution sources.

When the injection volume is 1.0ml, the detection limit of this standard for the determination of total hydrocarbons and methane is 0.06 mg/m3 (calculated as methane), and the lower limit of detection is 0.24 mg/m3 (calculated as methane); non-methane total hydrocarbons The detection limit is 0.07 mg/m3 (calculated by carbon), and the lower limit of determination is 0.28 mg/m3 (calculated by carbon).

2 Normative references
      This standard refers to the following documents or clauses thereof. For undated references, the valid edition applies to this standard.
      HJ 194 Technical Specification for Manual Monitoring of Ambient Air Quality
      HJ 664 Technical Specifications for Layout of Ambient Air Quality Monitoring Points (Trial)
      HJ 732 Sampling air bag method for volatile organic compounds in waste gas from stationary pollution sources
      HJ/T 55 Technical guidelines for monitoring fugitive emissions of air pollutants

3 Terms and Definitions

      The following terms and definitions apply to this standard.

3.1

      total hydrocarbons (THC)

Refers to the sum of gaseous organic compounds that respond on the hydrogen flame ionization detector of a gas chromatograph under the measurement conditions specified in this standard.

3.2

      nonmethane hydrocarbons (NMHC)

Refers to the sum of other gaseous organic compounds after deducting methane from total hydrocarbons under the measurement conditions specified in this standard (unless otherwise stated, the results are in carbon terms).

4 Principles of the method

The gas sample was directly injected into a gas chromatograph with a hydrogen flame ionization detector, and the contents of total hydrocarbons and methane were measured on the total hydrocarbon column and the methane column, respectively, and the difference between the two was the content of non-methane total hydrocarbons.

Determination of ambient air methane HJ 604-2017 test spectrum: