Gas chromatography-surface acoustic wave rapid analysis and determination method for aldehyde and ketone materials

A technology of gas chromatography and surface acoustic wave, which is applied in the field of instrument analysis, can solve the problems of long analysis time and inability to realize on-site analysis, and achieve the effects of short analysis time, improved analysis sensitivity and convenient operation

Inactive Publication Date: 2011-02-09
BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method with fast analysis speed, high sensitivity and on-site analysis of aldehydes and ketones, so as to overcome the shortcomings of the current existing analysis method that the analysis time is long and the on-site analysis cannot be realized

Method used

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  • Gas chromatography-surface acoustic wave rapid analysis and determination method for aldehyde and ketone materials
  • Gas chromatography-surface acoustic wave rapid analysis and determination method for aldehyde and ketone materials
  • Gas chromatography-surface acoustic wave rapid analysis and determination method for aldehyde and ketone materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Adopt GC-SAW (Gas Chromatography-Surface Acoustic Wave) fast analyzer, in which the GC part is mainly composed of sample collection system: including sample sampling tube and thermal desorption device for sample tube heating; sampling and analysis state switching system: six-way A valve and its switching device; a sample separation system: a chromatographic column and a chromatographic column temperature control device; and a carrier gas flow control system.

[0020] Surface acoustic wave sensor: The substrate is ST-X quartz crystal, the center frequency of the resonator is 516.5MHz, and the temperature control range of semiconductor refrigeration is -10℃~150℃.

[0021] Instrument conditions: sampling port temperature: 200°C; valve box temperature 165°C; chromatographic column temperature: 40-180°C, programmed temperature, heating rate: 10°C / s; sensor temperature 60°C; carrier gas using helium, carrier gas flow rate 3mL / min.

[0022] Sampling device: sample collection ...

Embodiment 2

[0036] Determination of the minimum detectable concentration of aldehydes and ketones by gas chromatography-surface acoustic wave rapid analyzer.

[0037] The experimental conditions and sample preparation were the same as those in Example 1, and the mass corresponding to 3 times the baseline noise response value was taken as the minimum detection amount of the instrument. The experimental results are as follows:

[0038] name

Minimum detection mass μg

formaldehyde

3.8×10 -7

Acetaldehyde

7.7×10 -7

acetone

8.03×10 -7

Butanone

6.93×10 -7

[0039] When a 10L air sample was collected with a DNPH tube, and then eluted with 4 mL of acetonitrile, 0.2 μL of the eluted sample was taken for analysis, the retention time was qualitative, and the peak area was quantitative. The minimum detection concentration of aldehydes and ketones by this method is:

[0040] name

Embodiment 3

[0042] Experimental conditions: the flow rate of the carrier gas is 3-10 mL / min, the temperature of the chromatographic column is 40-230 °C, and the temperature of the sensor is 10-80 °C. The experimental apparatus and other experimental conditions are the same as those in Example 1.

[0043] Select a decorated room, adopt the method of the present invention to detect the formaldehyde content in the air:

[0044] (1) Instrument calibration

[0045] Take a standard solution with a concentration of 1 mg / mL formaldehyde phenylhydrazone, dilute it by 200 times, 100 times, 50 times, and 20 times, respectively, and then inject and analyze at each concentration point. The injection volume is 0.2 μL, and the peak area is recorded. A standard working curve was obtained by performing a least squares regression on the peak area by mass.

[0046] (2) Sample collection

[0047] At the sampling site, take a sampling tube coated with 2,4-dinitrophenylhydrazine (fill a 10mL medical syringe...

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Abstract

The invention relates to a gas chromatography-surface acoustic wave rapid analysis and determination method for aldehyde and ketone materials, which utilizes gas chromatography and a surface acoustic wave sensor to rapidly analyze the concentration of the aldehyde and ketone materials and belongs to an instrument analysis method. The rapid analysis and determination method of the invention comprises the following steps: sampling the aldehyde and ketone materials in air; preprocessing samples, i.e. enabling the samples to be reacted with 2, 4-dinitrophenylhydrazine to prepare phenylhydrazone corresponding to the aldehyde and ketone materials; and adopting the gas chromatography and surface acoustic wave rapid analysis instrument to analyze the samples. The method of the invention has the advantages of short analysis time, analysis solution on the surface acoustic wave sensor of the volatile aldehyde and ketone materials, great analysis sensitivity enhancement, convenient operation and site analysis realization.

Description

technical field [0001] The invention relates to a gas chromatography-surface acoustic wave rapid analysis and determination method for aldehydes and ketones, which utilizes gas chromatography and a surface acoustic wave sensor to rapidly analyze the concentration of aldehydes and ketones, belonging to an instrumental analysis method. Background technique [0002] Aldehydes and ketones are the main pollutants in indoor air, and aldehydes and ketones have a serious impact on human health. Since formaldehyde is released from man-made boards, wall paints, wallpapers and textile fiber products in the home that are widely used in interior decoration, the concentration of formaldehyde in indoor air is very high. Acrolein is also produced during cooking in the kitchen. At present, the detection methods of aldehydes and ketones mainly use liquid chromatography, and the current methods have disadvantages such as high analysis cost and low analysis efficiency. SUMMARY OF THE INVENTI...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02G01N30/12G01N30/02
Inventor 丁辉赵寿堂朱佐刚靳江红胡玢王栋宁占武
Owner BEIJING MUNICIPAL INST OF LABOUR PROTECTION
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