Solid-phase microextraction fiber development for sampling and analysis of volatile organohalogen compounds in air.

Seyed Ghavameddin Attari,Farshid Ghorbani Shahna,Abdolrahman Bahrami,Mahmoud Heidari

doi:10.1186/s40201-014-0123-5

Abstract

A green, environmental friendly and sensitive method for determination of volatile organohalogen compounds was described in this paper. The method is based on a homemade sol–gel single-walled carbon nanotube/silica composite coated solid-phase microextraction to develop for sampling and analysis of Carbon tetrachloride, Benzotrichloride, Chloromethyl methyl ether and Trichloroethylene in air. Application of this method was investigated under different laboratory conditions. Predetermined concentrations of each analytes were prepared in a home-made standard chamber and the influences of experimental parameters such as temperature, humidity, extraction time, storage time, desorption temperature, desorption time and the sorbent performance were investigated. Under optimal conditions, the use of single-walled carbon nanotube/silica composite fiber showed good performance, high sensitive and fast sampling of volatile organohalogen compounds from air. For linearity test the regression correlation coefficient was more than 98% for analyte of interest and linear dynamic range for the proposed fiber and the applied Gas Chromatography-Flame Ionization Detector technique was from 1 to 100 ngmL−1. Method detection limits ranged between 0.09 to 0.2 ngmL−1 and method quantification limits were between 0.25 and 0.7 ngmL−1. Single-walled carbon nanotube/silica composite fiber was highly reproducible, relative standard deviations were between 4.3 to 11.7 percent.

Highlights

Halogenated volatile organic compounds (HVOCs) that known as volatile organohalogen compounds or organohalogen solvents are one of the most important organic environmental and occupational pollutants, because of their vast usage and high toxicity
Surface structure of the fiber The characterization of obtained single wall carbon nanotubes (SWCNTs) checked by scanning electron microscopy (SEM) and the elements mass were, before and after sol–gel process were calculated by EDS analysis (Figure 1)
The results indicated that the SWCNTs/silica composite coated fiber had good extraction capacity and equilibration time for the HVOCs as analytes of interest

Summary

Introduction

Halogenated volatile organic compounds (HVOCs) that known as volatile organohalogen compounds or organohalogen solvents are one of the most important organic environmental and occupational pollutants, because of their vast usage and high toxicity These compounds have at least one halogen (fluorine, chlorine, bromine, iodine) atom with vapor pressure of more than 10 Pa at 20°C [1]. The trend for solid phase microextraction (SPME) based preconcentration methods is increasing, which do not need expensive on-line heating and enable high-yield analysis of HVOCs at trace-level concentrations. This method is one of the widely accepted and applied techniques. Integrating sampling, extraction, concentration and sample introduction in a single process has been done by SPME that is mainly carry out on SPME fibers

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