title: Determination of degradation products of chemical warfare agents in water using hollow fibre-protected liquid-phase microextraction with in-situ derivatisation followed by gas chromatography-mass spectrometry.
abstract: Hollow fibre-protected liquid-phase microextraction (HF-LPME) together with gas chromatography/mass spectrometry was investigated for the analysis of degradation products of chemical warfare agents in water samples. The degradation products studied were those of nerve and blister agents, and a psychotomimetic agent. Extractions were successfully performed coupled with in-situ derivatisation using a mixture of solvent and derivatising agent. The protection of the moisture-sensitive derivatising agent was afforded by the hollow fibre. Parameters such as extraction solvent, pH, salt concentration, stirring speed and extraction time were optimised using spiked deionised water samples. The linear range established was between 0.005 and 5 microg ml(-1) depending on analyte, with squared regression coefficients ranging from 0.9929 to 1.0000. Relative standard deviations ranged from 9% to 22%. As compared to those of solid-phase microextraction, the limits of detection (0.01-0.54 microg l(-1)) of the newly-developed approach were significantly improved.
authors: DSO National Laboratories, 20 Science Park Drive, Singapore 118230, Singapore.
authors: Hoi Sim Nancy
authors: HS
authors: Lee
authors: Mui Tiang
authors: MT
authors: Sng
authors: Chanbasha
authors: C
authors: Basheer
authors: Hian Kee
authors: HK
authors: Lee
mesh_terms: D002619:Chemical Warfare Agents / Q000032:analysis* / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D015394:Molecular Structure; D015203:Reproducibility of Results; D012997:Solvents / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
chemical_list: D002619:Chemical Warfare Agents; D012997:Solvents; D014874:Water Pollutants, Chemical