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Method for determining flux of non-methane hydrocarbon (NMHC) in grassland area

A technology of non-methane total hydrocarbons and determination method, which is applied in the field of non-methane total hydrocarbon flux determination in grassland areas, can solve the problems of less attention to natural emission sources, and achieves high accuracy of results, scientific and accurate methods, and rigorous experimental design. Effect

Inactive Publication Date: 2020-05-15
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0004] At present, most of the research on non-methane total hydrocarbons is to improve the method of determining its content, and the monitoring scope is mostly in urban areas. less attention

Method used

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  • Method for determining flux of non-methane hydrocarbon (NMHC) in grassland area
  • Method for determining flux of non-methane hydrocarbon (NMHC) in grassland area
  • Method for determining flux of non-methane hydrocarbon (NMHC) in grassland area

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Embodiment Construction

[0036] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0037] The specific process of the assay method of non-methane total hydrocarbon flux in grassland area of ​​the present invention is:

[0038] Step a, collecting gas samples in the field and determining the flux parameters of non-methane total hydrocarbons. After consulting the data and field investigation and research, 11 sample plots in the Xilinhot grassland research area were selected for field collection of gas samples by the static box method;

[0039] Step a1, the collection of gas samples for field experiments. Set up static boxes at various points within two days. The gas in the box at 0, 10, and 20 minutes is collected into a 1L aluminum foil gas sampling bag and labeled;

[0040] Step a2, the field measurement of non-methane total hydrocarbon flux parameters, the parameters required for the fi...

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Abstract

The invention belongs to the field of grassland ecological environment detection, and particularly relates to a method for determining the flux of non-methane hydrocarbon (NMHC) in a grassland area. The method comprises the following steps: a, collecting a field gas sample and determining the flux parameter of the non-methane hydrocarbon; b, selecting a non-methane total hydrocarbon concentrationcalculation standard; c, indirectly measuring the concentration of non-methane total hydrocarbon; d, calculating the non-methane total hydrocarbon flux; and e, analyzing the non-methane total hydrocarbon concentration and flux emission intensity of the grassland area. The method has the advantages that (1) a gas sample is collected outdoors by a static box method, the operation is simple and feasible, and the sample point measurement precision is high; (2) the static box only covers the ground for 20 minutes every time, so that the grassland ecological system is not greatly disturbed, and theoperation is scientific and reasonable; (3) the concentration of the non-methane total hydrocarbon gas in the gas sample is measured by adopting a gas chromatograph provided with a hydrogen flame iondetector (FID), and the flux of the non-methane total hydrocarbon is calculated, so that the method is accurate and efficient; and (4) the emission intensity of the non-methane total hydrocarbon in the grassland area is explored as a natural emission source.

Description

technical field [0001] The invention relates to the field of grassland ecological environment detection, in particular to a method for measuring non-methane total hydrocarbon flux in grassland areas. [0002] technical background [0003] Non-methane hydrocarbons (Non-Methane Hydrocarbon, NMHC) generally refer to all hydrocarbons except methane (mainly C 2 -C 8 ) collectively. Non-methane total hydrocarbons, as one of the factors of photochemical smog formation, are trace amounts and change rapidly. When its concentration is too high, it will anesthetize the central nervous system of the human body, stimulate the skin and mucous membranes and cause dermatitis and eczema, and long-term exposure to non-methane total hydrocarbons will poison the human hematopoietic system and reproductive system, which has attracted more and more attention. [0004] At present, most of the research on non-methane total hydrocarbons is to improve the method of determining its content, and the ...

Claims

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Application Information

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IPC IPC(8): G01N30/02
CPCG01N30/02
Inventor 杨秀影李素英周舆赵鹏程常英
Owner INNER MONGOLIA UNIV OF TECH
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