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Online measurement method for biological source volatile organic compounds

A volatile organic compound and measurement method technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of high operation and maintenance requirements, complicated steps, complicated calibration process, etc., to meet the needs of environmental analysis instruments, reduce operation steps, Simple operation and maintenance

Pending Publication Date: 2022-07-22
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The offline measurement method of adsorption tube sampling + TD-GC-MS analysis has disadvantages such as long period, complicated steps, easy loss of samples, selectivity of adsorbent, and large system error.
In addition, this method is difficult to carry out long-term, continuous and effective measurement
Although the PTR-MS online measurement method has a high time resolution, the method cannot separate isomers, while monoterpenes (both molecular weights are 136.23) and sesquiterpenes (molecular weights are both 204.35) in BVOCs are all Isomers, so PTR-MS has obvious deficiencies in the qualitative and quantitative analysis of BVOCs
In addition, PTR-MS also has disadvantages such as high price, high operation and maintenance requirements, and complicated calibration process.

Method used

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  • Online measurement method for biological source volatile organic compounds
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  • Online measurement method for biological source volatile organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] In this example, the method of the present invention is investigated in terms of repeatability, detection limit, lower limit of quantification, accuracy, sample recovery rate, memory effect and the like.

[0119] Configure the mixed standard test gas with a concentration of 0.2pptv, and the injection volume is 20mL. According to the method of the present invention, 8 groups of experiments are performed in parallel. , the degree of freedom is 7, the t distribution value is 99%, the t distribution value is 2.998, and S is the standard deviation of 8 parallel determinations) to calculate the detection limit. ), 7 mixed standard gas of higher concentration (4ppt), the injection volume is 400mL, and 7 experiments are performed in parallel according to the method of the present invention, and the blank addition recovery rate is calculated according to the blank addition to calculate the accuracy, and the relative standard deviation is carried out. The calculation, method dete...

Embodiment 2

[0127] In this example, 7 kinds of BVOCs in ambient air were measured online, and the diurnal variation characteristics were obtained.

[0128] (1) Preparation of mixed standard gas

[0129] Use a device consisting of a stainless steel vaporization needle connected to a Summa tank and a dynamic diluter to evaporate and dilute the mixed standard solution, dilute a certain concentration of mixed standard solution and distilled water with high-purity nitrogen (purity ≥99.999%) to a concentration of 4pptv relative Mixed standard use gas with a humidity of 50%, stored in a 15L Summa tank with high-purity nitrogen (purity ≥99.999%) repeatedly cleaned and evacuated for 8-10 times to a vacuum level below 50mTorr (the pressure in the Summa tank is less than 40psi)

[0130] (2) Draw the standard curve

[0131] By analyzing a set of mixed standard gas (standard gas of the same concentration) with increasing volume gradient, interfering substances such as water are removed by pre-concent...

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Abstract

The invention discloses an on-line measurement method of a biological source volatile organic compound. The on-line measurement method comprises a sample collection step, a pre-concentration step and a biological source volatile organic compound determination step. The BVOCs measured by the online measurement method provided by the invention are large in molecular weight, high in boiling point and high in sensitivity, interference factors in the measurement process are few, and online accurate measurement and long-term continuous observation of the BVOCs in plant sources and ambient air can be realized.

Description

technical field [0001] The invention relates to the technical field of biologically derived volatile organic compounds measurement, in particular to an online measurement method of biologically derived volatile organic compounds, and more particularly, to an online measurement of biologically derived volatile organic compounds based on low-temperature preconcentration-gas chromatography-mass spectrometry technology Measurement methods. Background technique [0002] Biogenic Volatile Organic Compounds (BVOCs) refers to a type of volatile organic compounds emitted into the atmosphere by animals, plants, microorganisms and other organisms, mainly including isoprene (C 5 H 8 ), monoterpenes (Monoterpenes, C 10 H 16 ), sesquiterpene (Sesquiterpene, C 15 H 24 ), alcohols, aldehydes, ketones, esters, etc. BVOCs have strong chemical activity and have important effects on the formation of photochemical smog in the atmosphere, the formation of ozone, the formation of secondary o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/72G01N30/68
CPCG01N30/02G01N30/06G01N30/72G01N30/68
Inventor 龚道程王好王伯光刘世伟李勤勤
Owner JINAN UNIVERSITY
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