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A method for online monitoring of volatile organic compounds in the atmosphere

An organic compound and volatile technology, applied in the field of online monitoring of volatile organic compounds in the atmosphere, can solve the problems of time-consuming and laborious pretreatment of complex samples, hysteresis of analysis and monitoring, and non-continuous monitoring, etc., to improve production efficiency and repeatability , low detection limit, the effect of avoiding pollution and loss

Active Publication Date: 2020-11-03
SHANGHAI IMPACT SCI INSTR
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an online monitoring method for volatile organic compounds in the atmosphere, which can effectively solve the hysteresis of analysis and monitoring in the existing offline detection technology, time-consuming and laborious pretreatment of complex samples, sampling blind spots, Problems such as inability to continuously monitor

Method used

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  • A method for online monitoring of volatile organic compounds in the atmosphere
  • A method for online monitoring of volatile organic compounds in the atmosphere
  • A method for online monitoring of volatile organic compounds in the atmosphere

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Experimental program
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Effect test

Embodiment

[0036] 1. The experimental equipment and reagents required for this embodiment are listed below.

[0037] 1. Experimental equipment:

[0038] Fully automatic online monitoring system for volatile organic compounds in the atmosphere;

[0039] Gas Chromatograph - Hydrogen Flame Ionization Detector;

[0040] 2. Experimental reagents and materials:

[0041] (1) TVOC standard solution: 9 compounds including benzene, toluene, butyl acetate, ethylbenzene, p-xylene, m-xylene, o-xylene, styrene, and n-undecane, with a concentration of 2000 μg / mL;

[0042] (2) adsorption tube, the filler is Tenax TA;

[0043] (3) High-purity nitrogen, purity ≥ 99.999%;

[0044] (4) High-purity air, purity ≥ 99.999%;

[0045] (5) High-purity hydrogen, purity ≥ 99.999%;

[0046] Two, the experimental procedure of present embodiment is described below

[0047] 1. Preparation of standard curve

[0048] The standard solution of TVOC was diluted with methanol to 10 μg / mL, 50 μg / mL, 100 μg / mL, 500 μg / m...

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Abstract

The invention provides an on-line monitoring method of volatile organic compounds in atmosphere. The method comprises the following steps: volatile organic compounds in atmosphere are adsorbed by using a first cold trap for a several time; after adsorption, the first cold trap is heated, and the volatile organic compounds in atmosphere are gasified; gasified organic compounds are separated by using gas chromatography; a hydrogen flame ionization detector is used for detecting gas after separation, and contents of components in the volatile organic compounds in atmosphere are obtained. The method is advantageous in that the problems hysteresis quality in analysis and monitoring in prior off-line detection technology, time consuming and labor consuming in pretreatment of complex samples, blind spots in sampling, discontinuous monitoring, and the like are effectively solved.

Description

technical field [0001] The invention relates to the field of atmospheric organic matter detection, in particular to an online monitoring method for volatile organic compounds in the atmosphere. Background technique [0002] Volatile organic compounds (VOCs) are ubiquitous in the atmosphere and have the most serious impact on the environment. VOCs mainly come from motor vehicle emissions (43.7%), technological processes (26.0%), fixed combustion sources (19.3%), solvent paint use (6.3%), and oil storage and transportation processes (4.7%), among which motor vehicles Exhaust emissions are the most serious. The composition of VOCs is complex, and its content is mostly in trace or trace levels. Most of these organic pollutants are carcinogenic, teratogenic, and mutagenic, and pose a serious threat to the environmental safety on which human beings depend. At present, all countries in the world have increased the determination of VOCs in environmental monitoring projects. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02
Inventor 冯利辉赵学伟王宏沈利华亢磊
Owner SHANGHAI IMPACT SCI INSTR
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