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Applications using the chlorine-selective pulsed discharge emission detector.

K Sun1, W E Wentworth, S D Stearns

  • 1Department of Chemistry, University of Houston, TX 77204-5641, USA.

Journal of Chromatography. A
|April 5, 2000
PubMed
Summary

The chlorine-selective pulsed discharge emission detector (Cl-PDED) offers superior sensitivity for analyzing organochlorine compounds. Its consistent response makes it a preferred tool over electron-capture detectors for environmental sample analysis.

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Spectroscopy

Background:

  • Gas chromatography (GC) is crucial for analyzing environmental pollutants.
  • Chlorinated organic compounds, including pesticides and PCBs, pose significant environmental and health risks.
  • Sensitive and selective detection methods are essential for accurate environmental monitoring.

Purpose of the Study:

  • To demonstrate the utility of the chlorine-selective pulsed discharge emission detector (Cl-PDED) for GC analysis of various EPA mixtures and chlorinated compounds.
  • To evaluate the sensitivity and response characteristics of the Cl-PDED for organochlorine pesticides and polychlorinated biphenyls (PCBs).
  • To compare the performance of the Cl-PDED with the electron-capture detector (ECD) for chlorine-containing analytes.

Main Methods:

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  • Gas chromatography (GC) coupled with a chlorine-selective pulsed discharge emission detector (Cl-PDED).
  • Analysis of EPA standard mixtures (502, 612, 624), organochlorine pesticides, and polychlorinated biphenyls (PCBs).
  • Determination of minimum detectability and response linearity for chlorine-containing compounds.

Main Results:

  • The Cl-PDED demonstrated high sensitivity, achieving a minimum detectability of 50 fg Cl/s.
  • A constant and predictable response per picogram of chlorine was observed across different compounds, irrespective of molecular structure or chlorine atom count.
  • Sensitivities for PCBs using Cl-PDED were comparable to ECD, but with a more reliable and consistent response.

Conclusions:

  • The Cl-PDED is a highly sensitive and selective detector for chlorine-containing compounds in GC analyses.
  • Its predictable response characteristic offers a significant advantage over the variable response of the electron-capture detector for environmental applications.
  • The Cl-PDED is a valuable tool for the accurate and sensitive analysis of organochlorine pesticides and PCBs in environmental samples.