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Sampling method for rapid detection of volatile organic compounds in liquid by direct mass spectrometry

A volatile organic compound and mass spectrometry technology, which is used in measurement devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of high test sensitivity, unsuitable for high-throughput comprehensive analysis of unknown liquid samples, and different enrichment efficiencies.

Inactive Publication Date: 2018-05-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, membrane injection has different enrichment efficiencies for different samples. Substances with high solubility in the membrane are highly sensitive, and substances with low solubility in the membrane are basically not detected. Therefore, membrane injection mass spectrometry is not suitable for high-temperature unknown liquid samples. Full throughput analysis

Method used

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  • Sampling method for rapid detection of volatile organic compounds in liquid by direct mass spectrometry

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Experimental program
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Effect test

Embodiment 1

[0016] When the cross-sectional area of ​​the airtight container at the sample outlet is equal to the cross-sectional area of ​​the airtight container where the sample liquid to be tested is placed, the experimental result: as the sampling proceeds, a large number of air bubbles will enter the mass spectrometer through the sample outlet on the bottle cap, resulting in The air pressure during the test of the mass spectrometer is unstable, and the signal acquisition is wrong.

Embodiment 2

[0018] When the cross-sectional area of ​​the airtight container at the sample outlet is smaller than the cross-sectional area of ​​the airtight container where the sample liquid to be tested is placed, the experimental result: as the sampling proceeds, a large number of air bubbles will enter the mass spectrometer through the sample outlet on the bottle cap, As a result, the air pressure during the test of the mass spectrometer is unstable, and the signal acquisition error occurs.

Embodiment 3

[0020] When the height of the bottle body is 10cm, the inner diameter is 2cm, and the liquid level of the sample liquid to be tested is 8cm away from the bottom of the airtight container, the experimental result: as the sampling proceeds, a large number of air bubbles will enter the mass spectrometer through the sample outlet on the bottle cap, causing the mass spectrometer to The air pressure during the test was unstable, and the signal acquisition was wrong.

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Abstract

The invention discloses a sampling method for rapid detection of volatile organic compounds in a liquid by direct mass spectrometry. A device used in the method is similar to a grinding-contact glassbottle. The main body of the grinding-contact glass bottle is a bottle cap and a bottle body which are in sealed connection. The bottle cap is connected with a sample channel and a carrier gas pipeline. The bottle body is filled with a liquid sample to be measured. The inlet of the carrier gas pipeline is connected with a carrier gas source, and the outlet of the carrier gas pipeline is located below the level of the liquid sample; the outlet of the carrier gas pipeline comprises 6 to 10 small holes with internal diameters of 0.5 to 1.5 mm. During sampling and analysis, a carrier gas brings out the volatile organic compounds from the interior of the liquid, and enters through the sample channel a mass spectrometer for analysis and detection. When the carrier gas carries the sample, many small bubbles are generated inside the liquid. During the rise of the bubbles, the bubbles burst under the combined action of bubble gravity and the flow rate of the carrier gas. When the bubbles burst,a large amount of volatile organic compounds inside the liquid are released, and enter the mass spectrometer for rapid analysis and detection.

Description

technical field [0001] The invention belongs to a mass spectrometry sample introduction method, and provides a sample introduction method for rapid detection of volatile organic compounds in a liquid by direct mass spectrometry without any sample pretreatment. Background technique [0002] At present, the determination of volatile organic compounds (VOCs) in liquids is mostly carried out by pretreatment such as purge and trap, porous membrane extraction, micro-trapping and headspace combined with gas chromatography-mass spectrometry. It takes more than one hour to analyze a sample, and the analysis throughput is low; direct mass spectrometry is gradually being used for high-throughput and rapid analysis of volatile organic compounds in environmental samples due to its advantages of good universality and high sensitivity. Gaseous samples can be directly entered into a mass spectrometer for analysis, while liquid samples require certain pretreatments, such as heating and evapo...

Claims

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Application Information

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IPC IPC(8): G01N27/62
CPCG01N27/62
Inventor 李海洋王艳蒋吉春谢园园李庆运李函蔚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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