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Development of octadecyl-functionalized-nanotubular TiO2/Ti wire solid-phase microextraction fiber
Chunyan Chen1, Shaolei Yang, Di Pan
1State Key Laboratory of Chemo/Biosensing & Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, China.
The Analyst
|November 23, 2012
Summary
A novel octadecyl-functionalized solid-phase microextraction (SPME) fiber using anodized titanium wire offers enhanced stability and extraction efficiency for environmental analysis. This durable SPME fiber provides sensitive detection of polycyclic aromatic hydrocarbons in water samples.
Area of Science:
- Analytical Chemistry
- Materials Science
Background:
- Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
- Commercial SPME fibers often use fragile fused silica substrates, limiting their mechanical strength and thermal stability.
- There is a need for more robust and efficient SPME materials for environmental monitoring.
Purpose of the Study:
- To develop a novel octadecyl-functionalized SPME fiber with improved mechanical and thermal stability.
- To evaluate the extraction performance of the new SPME fiber for polycyclic aromatic hydrocarbons (PAHs).
- To demonstrate the applicability of the developed SPME fiber in environmental water sample analysis.
Main Methods:
- Preparation of an SPME fiber using sol-gel technology with an anodized titanium wire substrate.
- Coating the substrate with dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (C18-TMS) and tetraethoxysilane (TEOS).
- Characterization of the fiber's stability, extraction capability, and application in PAH analysis.
Main Results:
- The anodized Ti wire substrate provided superior mechanical strength and surface properties for sol-gel coating compared to fused silica.
- The C18-TMS/TEOS sol-gel coated fiber exhibited excellent thermal stability (up to 300 °C) and solvent resistance, maintaining performance over 100 cycles.
- The thin (2 μm) coating showed comparable or superior extraction efficiency to commercial 100 μm polydimethylsiloxane (PDMS) fibers.
- Low detection limits (0.003–0.025 μg L⁻¹) for PAHs were achieved with a wide linear range (0.01–20 μg L⁻¹).
- High recoveries (85.3–101.8%) were obtained in the analysis of environmental water samples.
Conclusions:
- The developed octadecyl-functionalized SPME fiber on an anodized Ti wire substrate is a robust and highly efficient alternative to commercial SPME fibers.
- This novel SPME material demonstrates significant potential for sensitive and reliable analysis of environmental pollutants.
- The sol-gel technology offers a promising route for fabricating advanced SPME devices with enhanced performance characteristics.
