Volatile Substance Profile Evaluation via Chromatogram Zone Integration
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Solution Overview
Problem
Existing methods for evaluating the profile of volatile and odorous substances in materials, such as polymeric waste, are not suitable for continuous monitoring in industrial processes due to their complexity, time requirements, and high costs, as they rely on manual odor panel evaluations and cannot adapt to the frequency and timing needs of production processes.
Innovation Solution
A method involving headspace sampling and gas chromatography-mass spectrometry (GC-MS) analysis, where samples and calibration samples are heated, and the gas chromatograms are divided into zones to calculate specific area ratios, providing a rapid and reproducible assessment of volatile and odorous substances without the need for peak identification or extensive pretreatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (VDA 270, VDA 278, UNI EN 13725:2022) are used for evaluating volatile and odorous substances, then measurement precision and reliability are improved, but analysis time and device complexity increase significantly
Solution Approach 1:
The invention extracts only the essential information needed for odour evaluation by integrating the total area of the gas chromatogram without requiring identification and quantification of individual peaks. This extracts the odour profile information while eliminating the time-consuming steps of peak identification and individual compound quantification required by conventional methods.
Solution Approach 2:
The gas chromatogram is divided into multiple sequential zones (at least 3 zones) representing different volatility ranges. This segmentation allows the complex chromatogram to be processed in manageable sections, with each zone's total area contributing to the overall odour profile evaluation, enabling rapid analysis while maintaining comprehensive coverage.
2Measurement precision
If conventional methods are used for evaluating volatile and odorous substances, then measurement precision is improved, but device complexity and operational complexity increase
Solution Approach 1:
The invention extracts only the total area integration of the gas chromatogram as the essential parameter for odour evaluation, eliminating the need for complex peak identification, compound quantification, and multiple processing steps required by conventional methods. This simplifies the methodology while maintaining measurement precision through calibration.
Solution Approach 2:
The invention changes the evaluation parameter from individual compound identification and quantification to total chromatogram area integration. This parameter change simplifies the analytical approach while maintaining odour evaluation precision through the use of calibration samples and standardized processing procedures.
3Measurement precision
If conventional methods are used for evaluating volatile and odorous substances, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The invention extracts the essential odour information by integrating the total area of the gas chromatogram, eliminating the need for time-consuming peak identification and individual compound analysis. This extraction approach maintains measurement precision while dramatically increasing analysis throughput and productivity.
Solution Approach 2:
The chromatogram is divided into sequential zones that can be rapidly integrated without detailed peak analysis. This segmentation enables fast processing of multiple samples while maintaining comprehensive odour profile evaluation, significantly improving productivity compared to conventional methods.
4Measurement precision
If manual odor panel evaluation is used, then measurement precision for odour perception is improved, but adaptability to continuous production monitoring decreases
Solution Approach 1:
The invention replaces the mechanical/manual odor panel evaluation system with an automated gas chromatography-based system. This substitution maintains measurement precision for odour perception through calibration while enabling continuous, high-throughput monitoring that can be integrated into production processes.
Solution Approach 2:
The invention changes the evaluation approach from subjective human panel assessment to objective instrumental measurement based on chromatogram area integration. This parameter change maintains odour perception accuracy through calibration while providing the adaptability and continuity needed for production monitoring.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for rapid, continuous, and cost-effective evaluation of volatile substance profiles, enabling timely monitoring and optimization of industrial processes, reducing the content of volatile substances, and correlating their reduction with odor reduction, while being applicable to both polymeric and non-polymeric materials.
Implementation Method 1
gas chromatography-mass spectrometry (GC-MS) analysis
Implementation Method 2
gas chromatography-mass spectrometry (GC-MS) analysis
Implementation Method 3
heating them for a predetermined period of time
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The method comprises a simple headspace sampling and GC-MS analysis of samples of the test material. A statistically significant comparison between samples is obtained by calibration with reference samples that ensure reproducibility of the results against a possible change in sensitivity of the gas chromatographic instrument. The method is quick to perform as the data obtained are analysed by integrating areas of a chromatogram without identifying and assigning each chromatographic peak individually.