Sulfur-Containing Compound Quantification With Stable Rubber Standards
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Solution Overview
Problem
Dibenzothiophene, commonly used as a standard material for quantifying sulfur-containing compounds, volatilizes over time in automatic samplers, leading to inconsistent peak areas and unreliable long-term measurements.
Innovation Solution
Using an alkylthiophene-containing rubber composition as a standard material for pyrolysis-GC/MS analysis, which is stable against heat and reduces variations in peak areas, enabling long-term stable measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dibenzothiophene is used as a standard material, then quantitative analysis of sulfur-containing compounds can be performed, but the peak area decreases over time due to volatilization in automatic samplers
Solution Approach 1:
The patent changes the physical state parameter of the standard material from pure liquid (dibenzothiophene) to solid form (alkylthiophene-containing rubber composition), which prevents volatilization and maintains peak area stability over time in automatic samplers
Solution Approach 2:
The patent uses a composite material (alkylthiophene incorporated into rubber composition) instead of a single pure substance, where the rubber matrix prevents volatilization of alkylthiophene while maintaining its characteristic pyrolysis signals for quantification
2Reliability
If alkylthiophene dissolved in organic solvent is used as standard material, then volatilization issue is avoided, but large variation in peak areas occurs
Solution Approach 1:
The patent changes the concentration parameter by incorporating alkylthiophene at specific content levels (0.1-10 parts by mass per 100 parts rubber) into the rubber composition, which provides stable peak areas without the large variations observed in dissolved solutions
Solution Approach 2:
The patent applies local quality by ensuring uniform distribution of alkylthiophene within the rubber matrix, where the rubber composition provides a stable local environment that maintains consistent pyrolysis behavior and peak area across multiple measurements
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
The method allows for accurate comparison of sulfur-containing compound amounts over different measurement dates by minimizing variations in peak areas, ensuring reliable and consistent quantification.
Implementation Method 1
pyrolysis gas chromatography/mass spectrometry (pyrolysis-GC/MS)
Implementation Method 2
pyrolysis gas chromatography/mass spectrometry (pyrolysis-GC/MS)
Implementation Method 3
pyrolysis-GC/MS analysis
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided is a method for quantifying sulfur-containing compounds enabling long-term stable measurement. The method for quantifying sulfur-containing compounds includes use of an alkylthiophene-containing rubber composition as a standard material.