Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for determining lower fatty acid in atmosphere through dynamic solid-phase microextraction and gas chromatography

A dynamic and extraction technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of poor repeatability, complex processing methods, low sensitivity, etc., and achieve the effects of low cost, good extraction effect and high sensitivity

Inactive Publication Date: 2016-01-06
TIANJIN ACADEMY OF ENVIRONMENTAL SCI
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to solve the problems of complex processing methods, poor repeatability, and low sensitivity in the prior art, and provide a method for measuring low-level fatty acids in the atmosphere by solid-phase microextraction-gas chromatography, which is accurate , fast, low interference, high sensitivity, good precision and accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining lower fatty acid in atmosphere through dynamic solid-phase microextraction and gas chromatography
  • Method for determining lower fatty acid in atmosphere through dynamic solid-phase microextraction and gas chromatography
  • Method for determining lower fatty acid in atmosphere through dynamic solid-phase microextraction and gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] refer to figure 1 Further description, a dynamic solid-phase microextraction device, it includes a sampling pump 1, a flow rate controller 2, a refitted three-way container 3, the inner diameter of the refitted three-way container is 4cm, a solid-phase microextraction fiber 4, a solid-phase microextraction The extraction fiber adopts 85um polyethylene glycol dioxane / polydimethylsiloxane (CAR / PDMS) extraction fiber produced by Beijing Kanglin Technology Co., Ltd. Sampling bag / sampling bottle 5, polytetrafluoroethylene connecting pipe 6 and waste gas bag 7. The sampling pump is connected to the flow rate controller through a Teflon connecting tube, and the flow rate controller is used to limit the flow rate of the sampling pump to meet the set flow rate requirements; the flow rate controller is connected to a modified three-way container through a Teflon connecting tube , the modified three-way container is connected with the solid-phase microextraction fiber, and the mo...

Embodiment 2

[0032] Concentration Determination of Gaseous Lower Fatty Acids in Atmospheric Samples

[0033] (1) Sample collection: ①The extraction fiber needs to be aged at 280°C for 1 hour before extraction, and a blank test should be carried out; ②Sampling steps: Connect the collected sample gas bag to the dynamic extraction device, and collect at a flow rate of 75ml / min for 20 minutes Air sample; ③ After sampling, take out the extraction fiber from the extraction device and quickly move it to the gas chromatograph inlet;

[0034] (2) Sample analysis part: After the extraction fiber is moved to the gas chromatography inlet, the sample is thermally decomposed in the vaporization chamber, and the sample is detected by the chromatographic column and detector;

[0035] (3) Drawing of the standard curve: use chromatographically pure standard solutions of six kinds of lower fatty acids, use methanol as the solvent, prepare standard mixed solutions with concentrations of 0, 40, 80, 200, 600, a...

Embodiment 3

[0037] Concentration Determination of Gaseous Lower Fatty Acids in Atmospheric Samples

[0038] (1) Sample collection: ①The extraction fiber needs to be aged at 280°C for 1 hour before extraction, and a blank test should be carried out; ②Sampling steps: Connect the collected sample gas bag to the dynamic extraction device, and collect at a flow rate of 95ml / min for 30 minutes Air sample; ③ After sampling, take out the extraction fiber from the extraction device and quickly move it to the gas chromatograph inlet;

[0039] (2) Sample analysis part: after the extraction fiber is moved to the gas chromatographic inlet, the sample is thermally decomposed in the vaporization chamber, and the sample is detected by the chromatographic column and detector;

[0040](3) Drawing of standard curve: Utilize chromatographically pure six kinds of lower fatty acid standard solutions, use methanol as solvent, prepare standard mixed solutions with concentrations of 0, 40, 80, 200, 600, 1000ug / L,...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
The inside diameter ofaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for determining lower fatty acid in the atmosphere through dynamic solid-phase microextraction and gas chromatography. According to the method, the solid-phase microextraction and gas chromatography coupling technology is adopted for performing qualitative and quantitative analysis on six kinds of common lower fatty acid in the atmosphere. A sampling pump, a flow velocity controller, a refit three-way container, a solid-phase microextraction device, a sampling bag / bottle and a waste gas bag are involved in the method and are connected through teflon connecting pipes. The dynamic solid-phase microextraction device is adopted for determining the lower fatty acid in ambient air and then moved to a gas chromatography sample inlet after extraction balance is achieved, and the gas chromatography method is adopted for performing thermal desorption detection. The method is accurate, fast to implement, small in interference and high in sensitivity, both precision and accuracy are kept within 10%, the good linear relation that R<2> is larger than 0.99 is achieved, all detection lines are smaller than 10 ppbv, and the recovery rate is 75%-110%. According to the technical scheme, the method is easy, convenient and fast to implement and can meet the requirements of detection work and research.

Description

technical field [0001] The invention relates to a method for measuring low-level fatty acids in the atmosphere, in particular to a method for determining low-level fatty acids in the atmosphere by using a solid-phase micro-extraction device through gas chromatography. Background technique [0002] Lower fatty acids are a type of typical malodorous gases, mainly including acetic acid, propionic acid, n-butyric acid, isobutyric acid, n-valeric acid, isovaleric acid, etc. Odor pollution caused by odorous gas is a kind of air pollution. With the development of industry and social progress, odor pollution has attracted more and more attention. Odor pollution not only disturbs people and affects the quality of life, but also causes physical discomfort and even poisoning at higher concentrations. The olfactory threshold of lower fatty acids is very low, and people can detect it at very low concentrations, but the instrument cannot detect it, resulting in differences between sensor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N30/02G01N30/08
Inventor 孟洁韩萌王亘翟增秀耿静鲁富蕾
Owner TIANJIN ACADEMY OF ENVIRONMENTAL SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com