HH-NMHC总烃柱 HJ/T 38-1999 固定污染源排气中非甲烷总烃的测定

名称：总烃柱

固定相：硅烷化玻璃微球或者空柱

规格：1m*3mm（内径），1m*1/8,    1M*4MM

型号：HH-NMHC

应用：HJ/T 38-1999 固定污染源排气中非甲烷总烃的测定 气相色谱法

1 适用范围

1.1 本标准适用于固定污染源有组织排放和无组织排放的非甲烷总烃（NMHC）测定。

1.2 NMHC的检出限为4x10^-2ng。当色谱进样量为1.0ml时，方法的检出浓度为4x10^-2mg/m³，方法的定量测定浓度范围为0.12~32mg/m³。

2 定义

非甲烷总烃（NMHC)：指除甲烷以外的碳氢化合物（其中主要是C₂~C₈）的总称。在本标准规定的条件下所测得的NMHC，是于气相色谱氢火焰离子化检测器有明显响应的除甲烷外碳氢化合物总量，以碳计。

3 方法原理

用双柱双氢火焰离子化检测器气相色谱仪，注射器直接进样，分别测定样品中的总烃和甲烷含量，以两者之差得非甲烷总烃含量。同时以除烃空气求氧的空白值，以扣除总烃色谱峰中的氧峰干扰。

HJ/T 38-1999 Determination of non-methane total hydrocarbons in exhaust gas from stationary pollution sources
HJ/T 38-1999 Determination of non-methane total hydrocarbons in exhaust gas from stationary pollution sources Detailed information:

Name: Total Hydrocarbon Column

Stationary phase: silanized glass microspheres or empty columns

Specifications: 1m*3mm (inner diameter), 1m*1/8, 1M*4MM

Model: HH-NMHC

Application: HJ/T 38-1999 Determination of non-methane total hydrocarbons in exhaust gas from stationary pollution sources-Gas chromatography

1 Scope of application

1.1 This standard is applicable to the determination of non-methane total hydrocarbons (NMHC) from fixed sources of organized and unorganized emissions.

1.2 The detection limit of NMHC is 4x10-2ng. When the chromatographic injection volume is 1.0ml, the detection concentration of the method is 4x10-2mg/m3, and the quantitative determination concentration range of the method is 0.12~32mg/m3.

2 Definitions

Non-methane hydrocarbons (NMHC): refers to the general term for hydrocarbons other than methane (mainly C2~C8). The NMHC measured under the conditions specified in this standard is the total amount of hydrocarbons other than methane that have a significant response to the gas chromatographic hydrogen flame ionization detector, measured in carbon.

3 Principles of the method

Using a gas chromatograph with a double-column double-hydrogen flame ionization detector and injecting the sample directly with a syringe, the total hydrocarbon and methane content in the sample were measured respectively, and the total non-methane hydrocarbon content was obtained from the difference between the two. At the same time, the blank value of oxygen was obtained by removing hydrocarbon air to deduct the interference of oxygen peaks in the chromatographic peaks of total hydrocarbons.