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Related Concept Videos

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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Sampling materials are classified into three main types: solid, liquid, and gas.
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Updated: Apr 25, 2026

Capturing Actively Produced Microbial Volatile Organic Compounds from Human-Associated Samples with Vacuum-Assisted Sorbent Extraction
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Development of syringe pump assisted headspace sampler.

Un Jeong Go1, In-Yong Eom2

  • 1Department of Life Chemistry, Catholic University of Daegu, Gyeongsan 712-702, Republic of Korea.

Journal of Chromatography. A
|August 27, 2014
PubMed
Summary

A new syringe pump assisted headspace sampler (SPHS) with a needle trap device (NTD) offers enhanced extraction efficiency for volatile organic compounds (VOCs). This SPHS-NTD system effectively analyzed TEX in river water with high recovery rates.

Keywords:
BTEXDynamic headspace samplingHeadspace samplerNeedle trap deviceWater analysis

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Area of Science:

  • Analytical Chemistry
  • Environmental Science

Background:

  • Headspace sampling is crucial for analyzing volatile organic compounds (VOCs) in various matrices.
  • Existing methods like solid-phase microextraction (SPME) have limitations in extraction efficiency and sample volume.

Purpose of the Study:

  • To develop and evaluate a novel syringe pump assisted headspace sampler (SPHS) integrated with a needle trap device (NTD).
  • To enhance the extraction efficiency of VOCs by sampling the whole headspace volume.
  • To assess the performance of the SPHS-NTD system for analyzing TEX (toluene, ethylbenzene, and o-xylene) in aqueous samples.

Main Methods:

  • A syringe pump's syringe was utilized as a sealed sample vial.
  • A needle trap device (NTD) served as a miniaturized sorbent tube for trapping VOCs.
  • The NTD was directly interfaced with a gas chromatograph for analysis.
  • The SPHS-NTD system's performance was compared against static headspace (HS) and SPME techniques.

Main Results:

  • The SPHS-NTD system achieved high extraction efficiency by sampling the entire headspace volume.
  • Calibration curves for TEX in aqueous solutions showed linearity in the concentration range of ~0.1-45 ng/mL.
  • Calculated limits of detection (LOD) for TEX were 0.13 ng/mL or lower.
  • The system demonstrated excellent recovery rates (97.2%–105.8%) when applied to river water samples.

Conclusions:

  • The SPHS-NTD platform provides a sensitive and efficient method for headspace analysis of VOCs.
  • This technique is suitable for the quantitative analysis of TEX in environmental water samples.
  • The SPHS-NTD system offers a promising alternative to conventional headspace sampling methods.