Instrument Introduction

The hydrocarbons that pollute the ambient air generally refer to volatile hydrocarbons (C₁~C₈）. There are two commonly used methods to represent it: one is hydrocarbons including methane, called total hydrocarbons (THC), and the other is hydrocarbons other than methane, called non methane hydrocarbons (NMHC).. In general, non methane total hydrocarbons are directly related to the combustion of fuels such as coal and petroleum, as well as the emissions of automobile exhaust.

The total hydrocarbon/non methane total hydrocarbon analysis gas chromatograph produced by Shanghai Kechuang Chromatography Instrument Co., Ltd. is a specialized instrument specially developed to implement the national environmental protection standards HJ604 and HJ/T38. The determination of total hydrocarbons and non methane total hydrocarbons is divided into two methods based on the removal of oxygen peak interference: using nitrogen as the carrier gas to measure the peak height of the oxygen peak and then deducting it, and directly using dehydrogenated air as the carrier gas to eliminate oxygen peak interference. The instrument adopts the most commonly used former scheme.

The instrument adopts a ten valve dual quantitative ring injection, dual column parallel single detector detection, and can analyze and detect total hydrocarbons and non methane total hydrocarbons in the ambient air in one injection, with good repeatability and high accuracy. The instrument is equipped with a dedicated non methane total hydrocarbon chromatography workstation, which has functions such as intelligent peak identification/automatic processing, multi-channel spectrum integration and exchange, automatic deduction of methane content and oxygen peak interference, etc.

detection limit

Execution standards

HJ 604-2011 Determination of Total Hydrocarbons in Environmental Air Gas Chromatography Method

HJ/T 38-1999 Determination of Non Methane Total Hydrocarbons in Fixed Source Exhaust Gas Gas Chromatography Method

Instrument features

4.1. LCD screen or 5.7-inch color touch screen;

4.2. A fully computerized reverse control system, with a single computer capable of controlling up to 253 chromatography instruments and 7 temperature control channels; 8-channel external event time program;

4.3. The instrument is equipped with a dedicated non methane total hydrocarbon chromatography workstation, which has functions such as intelligent peak identification/automatic processing, multi-channel spectrum integration and exchange, automatic deduction of methane content and oxygen peak interference, etc.;

4.4. The instrument adopts RJ45 Ethernet interface, which makes signal output and control acquisition simple and convenient, and can realize remote control, remote data transmission, processing and supervision of the instrument. Can be connected to unit supervisors and higher-level supervisors for easy supervision by supervisors;

4.5. Large capacity column box with automatic rear opening door, capable of 8-step programmed heating, and column box with near room temperature control function (5 ℃ above room temperature);

4.6. Equipped with fault self diagnosis function, displaying the location and nature of the fault at any time; Equipped with over temperature protection function, any temperature exceeding the set temperature will automatically stop heating.

Note: For other parameters of the instrument, please refer to the introduction of the gas chromatography host.

GC9800 gas chromatograph (link)

GC2002 gas chromatograph (link)

Instrument configuration

Note: The gas chromatograph host can be selected from GC9800 or GC2002 models.

Workstation operation interface

7. Analyze parameters and graphs

Methane standard gas analysis spectrum

Analysis spectrum of hydrocarbon removal air

Guiding technical article link

[1] Zhang Tianlong, Shi Jin, Qi Xiaohua Experimental study on the application of secondary thermal desorption technology to analyze TVOC [C]. Cross Strait Conference on Analytical Chemistry two thousand and six

[2] Zhang Tianlong, Qi Xiaohua, Shi Jin Rapid and accurate analysis of benzene derivatives in air using activated carbon tube secondary thermal desorption direct injection method [C]. Chemshow. cn. 2006

[3] State Environmental Protection Administration Monitoring and Analysis Methods for Air and Waste Gas [M]. China Environmental Science Press, two thousand and three

[4] Xu Bohong, Yan Huifang Monitoring Methods for Hazardous Substances in the Workplace [M]. China People's Public Security University Press, two thousand and three

[5] Cui Jiusi Indoor Air Pollution Monitoring Method [M]. Chemical Industry Press, two thousand and two

[6] Cui Jiusi Indoor Environment Detection Instruments and Application Technology [M]. Chemical Industry Press, two thousand and four

National/Industry Standard Links

GB/T18883-2002 Indoor Air Quality Standards

GB50325-2010 Code for Indoor Environmental Pollution Control of Civil Building Engineering (2013 Edition)

HJ583-2010 Determination of Benzene Compounds in Environmental Air Solid Adsorption/Thermal Desorption Gas Chromatography Method

GBZ/T 160.42-2007 Determination of Toxic Substances in Workplace Air - Aromatic Hydrocarbons

HJ 584-2010 Determination of Benzene Compounds in Environmental Air Activated Carbon Adsorption/Carbon Disulfide Desorption Gas Chromatography Method

GB 11737-1989 Standard Method for Hygienic Inspection of Benzene, Toluene, and Xylene in the Atmosphere of Residential Areas - Gas Chromatography Method