名稱：填充柱

色譜固定液：5%聚乙二醇
載體：石墨炭黑80-120目

規(guī)格：2m*3mm，2m*1/8

型號(hào)：5%Carbowax 20M Carbopack B

應(yīng)用： HJ T33-1999 固定污染源排氣中甲醇的測(cè)定氣相色譜法

 適用范圍

1.1 本標(biāo)準(zhǔn)適用于固定污染源有組織排放和無(wú)組織排放的甲醇測(cè)定。

1.2 以3倍噪音色譜峰高值計(jì)算，當(dāng)色譜進(jìn)樣量為1.0 ml時(shí)，方法的檢出限為2 mg/m³；定量測(cè)定的濃度范圍為5.0-10⁴ mg/m³。

2 方法原理
      載氣攜帶含有甲醇(CH₃OH）的試樣通過(guò)裝有固定相的色譜柱，流出色譜柱的甲醇由氫火焰離子化檢測(cè)器(FID)測(cè)定。以標(biāo)準(zhǔn)樣品色譜峰的保留時(shí)間進(jìn)行定性，以峰高（或峰面積）定量。

浩瀚色譜（山東）應(yīng)用技術(shù)開(kāi)發(fā)有限公司首先使用純水為吸收液,吸收空氣中的甲醇,再采用頂空氣相色譜法分析吸收液中甲醇濃度,由此建立了自動(dòng)頂空5%Carbowax 20M Carbopack B填充柱氣相色譜法測(cè)定空氣和廢氣中甲醇的方法,并對(duì)自動(dòng)頂空進(jìn)樣條件進(jìn)行了優(yōu)化。結(jié)果表明,當(dāng)采樣體積為24 L、吸收液體積5 mL時(shí),該方法的低檢出濃度為0.1 mg/m3,相對(duì)標(biāo)準(zhǔn)偏差為2.1%～5.3%,加標(biāo)回收率為95%～108%。該法操作簡(jiǎn)單,具有較好的靈敏度和的準(zhǔn)確度,自動(dòng)化程度高,可連續(xù)完成樣品的前處理、樣品進(jìn)樣和色譜分析。


頂空氣相色譜測(cè)定大氣污染物中甲醇含量  測(cè)試譜圖：


Determination of Methanol in Air Pollutants by Headspace Gas Chromatography
Determination of Methanol in Air Pollutants by Headspace Gas Chromatography Details:

Name: Packed Column

Chromatographic fixative: 5% polyethylene glycol
Carrier: graphite carbon black 80-120 mesh

Specifications: 2m*3mm, 2m*1/8

Model: 5%Carbowax 20M Carbopack B

Application: HJ T33-1999 Determination of methanol in exhaust gas from stationary pollution sources by gas chromatography



 Scope of application

1.1 This standard is applicable to the determination of methanol in organized and unorganized emissions from stationary pollution sources.

1.2 Calculated by 3 times the noise chromatographic peak height, when the chromatographic injection volume is 1.0 ml, the detection limit of the method is 2 mg/m3; the concentration range of quantitative determination is 5.0-104 mg/m3.

2 Principles of the method
      The carrier gas carries a sample containing methanol (CH3OH) through a chromatographic column equipped with a stationary phase, and the methanol flowing out of the chromatographic column is detected by a hydrogen flame ionization detector (FID). Qualitative by the retention time of the standard sample chromatographic peak, quantitative by peak height (or peak area).

Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. first used pure water as the absorption liquid to absorb methanol in the air, and then used headspace gas chromatography to analyze the methanol concentration in the absorption liquid, thus establishing an automatic headspace 5% Carbowax 20M Carbopack B. A method for the determination of methanol in air and waste gas by packed-column gas chromatography, and the automatic headspace injection conditions were optimized. The results show that when the sampling volume is 24 L and the absorption liquid volume is 5 mL, the minimum detection concentration of this method is 0.1 mg/m3, the relative standard deviation is 2.1%-5.3%, and the recovery rate of standard addition is 95%-108% . The method is simple to operate, has good sensitivity and reliable accuracy, and has a high degree of automation. It can continuously complete sample pretreatment, sample injection and chromatographic analysis.


Determination of methanol content in air pollutants by headspace gas chromatography Test spectrum: