Abstract
In this study for the first time, a novel copper Solid Phase Microextraction (SPME) fiber has been introduced for removal of naphthalene, phenanthrene and anthracene from aqueous solution. Copper was used as a solid support, which was at first coated by 3-mercaptopropyltrimethoxysi- lane. A stationary phase of oxidized multi walled carbon nanotube (MWCNTs)) was bonded to the surface of the copper wire. The developed SPME was characterized by IR and Scanning Electron Microscopy (SEM) and coupled to gas chromatography for separation of the analytes. Stability of the fiber, the effect of coating thickness and recovery time were optimized. The MWCNTs film thickness was about 5 μm which was perfect for a rapid mass transfer. The detection limits were at the range of 0.005 to 0.1 μg·L-1. The calibration curves were linear R2 > 0.9813 in the range of 0.01 to 5 μg·L-1. The method has been successfully applied for real samples with standard addition of 5 μL-1 of each sample. Stability study of the fiber to acid and alkali shows that it can be used for more than 50 times.
Highlights
Application of new fiber has been investigated in recent years to enhance durability and sensitivity of the solid phase microextraction fiber [1]-[5]
In this study a new method was developed to prepare chemically bonded Carbon nanotubes (CNTs) coating on modified copper surface to absorb low concentration of polycyclic aromatic hydrocarbons
1 g MWCNTs was first purified with HCl (8%) for 24 h so as to remove the metal ions and other impurities, refluxed in 20 ml HNO3 65% at 85 ̊C for 8 h with vigorous stirring
Summary
Application of new fiber has been investigated in recent years to enhance durability and sensitivity of the solid phase microextraction fiber [1]-[5]. Solid Phase Microextraction (SPME), has been developed by Arthur and Pawliszyn at the University of Waterloo in 1990 [17] and successfully used for the extraction of gas, liquid and solid, volatile and nonvolatile organic compounds from samples of soil, water and air [18]. This method is fast because the condensation and separation of analytes could be achieved in one step and the fibers can be used for several times, which makes them affordable and cheap. In this study a new method was developed to prepare chemically bonded CNTs coating on modified copper surface to absorb low concentration of polycyclic aromatic hydrocarbons. The fiber is connected to the gas chromatograph for further analysis
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