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Adsorption system and method for VOCs solid-phase microextraction

An adsorption system and extraction technology, applied in the field of VOCs solid-phase microextraction adsorption system, can solve the problems of difficult to control gas concentration, high recovery rate, low detection limit, etc., to reduce the use of hoses, high recovery rate, Effect of low detection limit

Pending Publication Date: 2020-11-24
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adsorption system and method for solid-phase microextraction of VOCs, which solves the existing problem that it is difficult to control the gas concentration through the generation of gas from the solution, and can realize the mixing of small flow gas, and the extraction and adsorption effect is good , with lower detection limit and higher recovery rate, good reproducibility

Method used

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Examples

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Embodiment 1

[0027] An adsorption simulation system for solid-phase microextraction of VOCs, the system includes: a gas mixing bottle, an extraction chamber, a flow meter and several high-pressure gas bottles. Wherein, each high-pressure gas bottle communicates with the gas inlet of the gas mixing bottle through a pipeline, and a flow meter is arranged on the pipeline between the high-pressure gas bottle and the gas mixing bottle, and the gas outlet of the gas mixing bottle is connected with the extraction chamber through a pipeline.

[0028] The quantity of gas to be mixed is consistent with the gas inlet quantity of the high-pressure gas bottle and the gas mixing bottle. Mixed gases include: nitrogen, benzene standard gas and toluene standard gas. High-pressure gas cylinders include: nitrogen high-pressure gas cylinders, benzene standard gas high-pressure gas cylinders and toluene standard gas high-pressure gas cylinders. There are three gas inlets on the side wall of the lower part of ...

Embodiment 2

[0033] A VOCs solid-phase microextraction simulation method, the method uses the system of embodiment 1, comprising:

[0034] (1) No extraction fiber is installed in the extraction chamber. Open the high-pressure gas cylinders of nitrogen, benzene and toluene standard gas in sequence, control the flow meter, and prepare a suitable concentration of gas. The three gases are mixed in a certain proportion to ensure The gas flow rate is the same to avoid gas mixing disorder (that is, the sum of the flow rates of the three gases and the total flow rate of the gas flowing through the three branch benzene standard gas, toluene standard gas, and high-purity nitrogen high-pressure gas cylinders to the extraction chamber are The same), let the gas flow through the entire gas path, and perform a certain pre-adsorption when the gas is stable. Since the extraction chamber and the gas mixing bottle are made of glass, and the connecting pipes are made of polytetrafluoroethylene hard tubes, the...

Embodiment 3

[0041] A VOCs solid-phase microextraction method, which is basically the same as in Example 2, the difference is that the diameter of the gas mixing bottle is 5 cm, and the diameter of the extraction chamber is 5 mm, and its extraction effect is better than that of Example 1.

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Abstract

The invention discloses an adsorption system and method for VOCs solid-phase micro-extraction. The system comprises a gas mixing bottle, an extraction chamber, a flow meter, a high-pressure gas bottle, a tail gas absorption device and a gas chromatography flame ionization detector, wherein each high-pressure gas bottle is communicated with a gas inlet of the gas mixing bottle through a pipeline, the flowmeter is arranged on the pipeline between the high-pressure gas bottle and the gas mixing bottle, a gas outlet of the gas mixing bottle is connected with a gas inlet of the extraction chamber through a pipeline, a gas outlet of the extraction chamber is communicated with the tail gas absorption device, and the tail gas absorption device is used for absorbing mixed gas. The adsorption systemcan realize mixing of small-flow gas, and is good in extraction and adsorption effect, short in time, relatively low in detection limit, relatively high in recovery rate and good in reproducibility.

Description

technical field [0001] The invention relates to a solid-phase microextraction adsorption system, in particular to an adsorption system and method for VOCs solid-phase microextraction. Background technique [0002] With the advancement of modern science and technology, the composition of the atmosphere is becoming more and more complex. Most of the volatile organic pollutants (VOCs) are toxic to the human body, and even trace amounts can cause irreparable damage to humans. Volatile organic pollutants generally refer to a boiling point below 260°C at normal pressure, or a saturated vapor pressure above 71Pa at room temperature. Volatile organic pollutants are highly volatile at room temperature due to their low boiling point and high saturated vapor pressure, and exist in the atmosphere in the form of gases. Volatile organic pollutants can be further divided into eight categories according to their chemical structures: alkanes, aromatics, alkenes, halogenated hydrocarbons, es...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/062
Inventor 李保会杨晓晶张乐洋张芝芝郑源硕
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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