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Related Concept Videos

Volatilization01:10

Volatilization

372
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

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Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
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Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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Vacuum-Assisted MonoTrapTM Extraction for Volatile Organic Compounds (VOCs) Profiling from Hot Mix Asphalt.

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This study characterizes volatile organic compound (VOC) emissions from hot mix asphalt using MonoTrap™ sorptive sampling. The RGC18-TD coating proved most effective for identifying key odor compounds.

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gas chromatography-mass spectrometryhot mix asphaltmonolithic material sorptive extractionodor emissionunder vacuum extractionvolatile organic compounds

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry

Background:

  • Hot mix asphalt (HMA) is a significant source of volatile organic compound (VOC) emissions.
  • Characterizing HMA's odor-active VOCs is crucial for environmental and health assessments.
  • Novel sorptive sampling methods are needed for efficient VOC analysis.

Purpose of the Study:

  • To evaluate MonoTrap™ technology for characterizing VOC emission profiles from HMA.
  • To identify key odor-active compounds contributing to HMA emissions.
  • To compare the performance of different MonoTrap™ coatings and sampling modes.

Main Methods:

  • Utilized MonoTrap™ sorptive sampling with automated thermal desorption (TD).
  • Analyzed VOCs from HMA using gas chromatography-mass spectrometry/olfactometry (GC-MS/O).
  • Employed chemometric analysis to compare coating performance and assess vacuum/non-vacuum sampling.

Main Results:

  • Identified 35 key odor-active volatile compounds in HMA emissions, primarily aldehydes, alcohols, and ketones.
  • MonoTrap™ RGC18-TD demonstrated superior performance in terms of peak area and equilibrium time.
  • Vacuum-assisted sampling significantly enhanced VOC uptake, particularly for higher boiling point compounds.

Conclusions:

  • MonoTrap™ technology, especially the RGC18-TD coating, is effective for characterizing HMA VOC emission profiles.
  • The hybrid silica and graphite carbon monolith adsorbent shows high adsorption capability, particularly for polar compounds.
  • Understanding the relationship between adsorbent physical characteristics and uptake rates is key for optimizing sorptive sampling.