Gas displacement and dynamic compensation sampling method in headspace analysis

A gas replacement and dynamic compensation technology, applied in the field of headspace analysis, can solve the problems of sample loss and long running time, and achieve the effect of short sampling time, good reproducibility and high test accuracy

Inactive Publication Date: 2010-02-03
CHENGDU COLIN TECH
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2) Due to the large contact surface causing sample loss, it needs to be rebalanced outside the sample bottle, and the running time is long;
[0008] 3) To change the injection volume, the sample loop must be replaced

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
  • Gas displacement and dynamic compensation sampling method in headspace analysis
  • Gas displacement and dynamic compensation sampling method in headspace analysis
  • Gas displacement and dynamic compensation sampling method in headspace analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] see figure 1 The gas replacement and dynamic sampling device for headspace analysis in this embodiment includes an outer needle 2 containing an inlet carrier gas hole 1 and a double needle 5 with an inner needle 4 containing an air outlet hole 3 that is passed through the outer needle. The first carrier gas pipeline 6 connected to the carrier gas hole communicates with the carrier gas source 7 . The first end of the inner needle connecting pipe 8 communicates with the air outlet of the inner needle. The first end of the second carrier gas pipeline communicates with the carrier gas source. Install between the second end of the second end of the carrier gas pipeline, the second end of the second carrier gas pipeline 10, the first end of the exhaust pipeline 12, and the delivery pipeline 9 that the first end communicates with the gas chromatograph inlet. There is a switching valve 13 for controlling the connection and disconnection of the inner needle connection pipeline...

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

No PUM Login to view more

Abstract

The invention relates to a gas displacement and dynamic compensation sampling method in headspace analysis, comprising the following steps: (1) configuring double needles having an inlet gas carrier hole and an air outlet hole; (2) placing a sample in a sample bottle and sealing the sample; (3) inserting the double needles into the sample bottle, feeding carrier gas into the sample bottle throughthe inlet gas carrier hole, exhausting the air in the sample bottle out of the sample bottle through the air outlet hole to finish gas displacement so that the sample bottle is in a closed state; and(4) heating the sample so that a component to be tested in the sample and the partial pressure in the headspace part are balanced, pressurizing the sample with carrier gas, communicating the air outlet hole with a gas chromatograph through a feeding pipeline, wherein the sample gas flows into the feeding pipeline through the air outlet hole, the carrier gas enters into the sample bottle through the inlet gas carrier hole, and pressure in the sample bottle is stable to achieve dynamic compensation sampling. The method can ensue that the sample is automatically isolated from oxygen and not oxidized under the heating condition, and ensure short sampling time, high testing precision and favorable repeatability in the subsequent headspace extracting process.

Description

Technical field: [0001] The invention relates to a headspace analysis method, in particular to a gas replacement and dynamic compensation sampling method for headspace analysis. Background technique: [0002] Headspace analysis is to put a gas, liquid or solid sample into a closed container, and form an equilibrium between the sample and the gas above it. Based on a fundamental law of physics, volatile compounds inherent in the sample will appear above it in gaseous form. The relative concentrations between the two phases will depend on the partial pressures of these compounds. We can analyze volatile organic compounds without the interference of non-volatile substances only by extracting a part of the gas phase substances. This is the headspace analysis method. The sample organic volatiles in the airtight headspace bottle will volatilize into the upper space after heating. In the traditional headspace analysis, after the sample gas in the upper part of the sample bottle ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/16
Inventor 何启发
Owner CHENGDU COLIN TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap