Related Experiment Video
Updated: Aug 15, 2026
07:57
Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
Published on: July 25, 2014
Development of thermal programmed desorption mass spectrometry methods for environmental applications
Sara I Nicholl1, Jeffrey W Talley
1University of Notre Dame, Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA.
Chemosphere
|October 18, 2005
Summary
Thermal programmed desorption mass spectrometry (TPD-MS) offers a faster method to assess hydrophobic organic contaminant (HOC) availability in soils and sediments. This technique simplifies environmental toxicity evaluations by measuring contaminant release energy.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Geochemistry
Background:
- The environmental toxicity of hydrophobic organic contaminants (HOCs) is often dictated by their physical availability in soils and sediments.
- Current methods for determining HOC physical availability are complex and time-consuming.
Purpose of the Study:
- To develop and validate thermal programmed desorption mass spectrometry (TPD-MS) protocols for assessing HOC physical availability in environmental matrices.
- To establish TPD-MS as a viable tool for environmental risk assessment of bound contaminants.
- To enable the calculation of contaminant release energy values.
Main Methods:
- Development of analytical protocols for TPD-MS analysis of HOCs desorbing from geosorbents.
- Focus on data processing requirements specific to environmental samples.
- Utilized simple geosorbents for method development and validation.
Main Results:
- Established TPD-MS analytical protocols and data processing methods for studying HOC desorption.
- Demonstrated the potential of TPD-MS to evaluate HOC physical availability and release energy.
- Provided a foundational understanding for applying TPD-MS to real-world environmental samples.
Conclusions:
- TPD-MS presents a promising, efficient alternative to traditional methods for assessing HOC physical availability in soils and sediments.
- The developed protocols facilitate the use of TPD-MS as a practical environmental assessment tool.
- This method allows for the quantification of energy required for contaminant release, aiding in risk assessment.
Related Concept Videos
01:21Tandem Mass Spectrometry
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
01:12Electrospray Ionization (ESI) Mass Spectrometry
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
01:21Mass Spectrometry: Complex Analysis
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
01:15High-Performance Liquid Chromatography: Types of Detectors
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...
01:19Gas Chromatography: Types of Detectors-II
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
01:24Mass Spectrum: Interpretation
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...