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Capillary Electrophoresis in Detection of Chemicals Related to the Chemical Weapons Convention

Chemical Weapons Chemicals Analysis

  1. Joy M. Ginter,
  2. John A. Tokarz III

Published Online: 9 JAN 2014

DOI: 10.1002/9780470027318.a0402.pub2

Encyclopedia of Analytical Chemistry

Encyclopedia of Analytical Chemistry

How to Cite

Ginter, J. M. and Tokarz, J. A. 2014. Capillary Electrophoresis in Detection of Chemicals Related to the Chemical Weapons Convention. Encyclopedia of Analytical Chemistry. 1–14.

Author Information

  1. Edgewood Chemical Biological Center, Aberdeen, MD, USA

  1. Update based on the original article by Camille A. Boulet, Encyclopedia of Analytical Chemistry, © 2000, John Wiley & Sons, Ltd.

Publication History

  1. Published Online: 9 JAN 2014

Abstract

This article describes the application of capillary electrophoresis (CE) to the analysis of compounds relevant to the Chemical Weapons Convention (CWC). CE is an analytical technique that employs narrow-bore, fused silica capillaries to perform high-efficiency separations of analytes based on their mobilities in an electric field. In CE, analytes are dissolved in a buffer solution and placed in a capillary to which an electric field is applied. The analytes then migrate at a rate determined by their charge and size and are detected as they migrate past a detector. CE can analyze a broad range of compounds and is particularly applicable to the analysis of water-soluble degradation products of scheduled compounds under the CWC. Compounds typically analyzed by CE include the hydrolysis products of nerve agents such as the alkylphosphonates and hydrolytic or oxidative products of the sulfur mustards such as thiodiglycol (TDG). The alkylphosphonates require the use of indirect ultraviolet (UV) detection or other detection methods as they do not possess a suitable UV chromophore. Degradation products of the sulfur mustards have been analyzed by micellar electrokinetic chromatography (MEKC) and direct UV detection. The ability of CE to analyze anionic, cationic, zwitterionic, and neutral CWC-related compounds, whether they be chemical warfare (CW) degradation products or scheduled starting materials, without the requirement for elaborate sample processing or labeling procedures, is an important demonstration of the utility of CE for the analysis of CWC-related compounds. CE can be an important screening method for rapid sample processing, and capillary electrophoresis coupled with mass spectrometry (CE-MS) can provide further analysis for unambiguous identification.