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Modified stainless steel wires with superwettability for highly efficient in-tube solid-phase microextraction
Ya-Ning Wang1, Yu-Ping Zhang2, Wan-Li You3
1College of Ecology and Environment, Zhengzhou University, Zhengzhou, 450001, China.
Journal of Chromatography. A
|April 18, 2023
Summary
Stainless-steel wires with tailored surface wettability were used for in-tube solid phase microextraction. Superhydrophobic wires efficiently extracted non-polar polycyclic aromatic hydrocarbons, while superhydrophilic wires excelled with polar estrogens.
Area of Science:
- Materials Science
- Analytical Chemistry
- Environmental Science
Background:
- Surface wettability is crucial for sorbent-target interactions in extraction processes.
- Tailoring surface properties of materials like stainless-steel wires (SSWs) can enhance analyte enrichment.
- Differentiating extraction capabilities for compounds of varying polarity is essential for complex sample analysis.
Purpose of the Study:
- To investigate the efficacy of stainless-steel wires with different surface wettabilities for extracting compounds of varying polarity.
- To develop and validate an in-tube solid phase microextraction (IT-SPME) method for analyzing polycyclic aromatic hydrocarbons (PAHs) and estrogens.
- To compare the performance of superhydrophobic and superhydrophilic SSWs in selective analyte enrichment.
Main Methods:
- Preparation of four types of SSWs with distinct hydrophobic/hydrophilic properties.
- Comparative in-tube solid phase microextraction (IT-SPME) of six non-polar PAHs and six polar estrogens.
- Optimization and validation of an IT-SPME coupled with High-Performance Liquid Chromatography (HPLC) method for PAH analysis.
Main Results:
- Superhydrophobic SSWs showed high extraction capacity for non-polar PAHs, with enrichment factors ranging from 29-744.
- Superhydrophilic SSWs demonstrated superior enrichment efficiency for polar estrogens compared to hydrophobic variants.
- The validated IT-SPME-HPLC method using a perfluorooctyl trichlorosilane (FOTS)-modified superhydrophobic wire achieved low detection limits (0.0056-0.32 μg L⁻¹) and good recoveries (81.5%-113.7%) for PAHs in lake water.
Conclusions:
- Surface wettability engineering of SSWs is effective for selective extraction of analytes with different polarities.
- Superhydrophobic FOTS-modified SSWs provide a robust and repeatable platform for sensitive determination of PAHs.
- The developed IT-SPME-HPLC method offers a promising approach for environmental monitoring of contaminants.
