Development of a novel solid-phase extraction element for thermal desorption gas chromatography analysis

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Conventional solid-phase microextraction (SPME) methods can be limited by absorbent capacity.
• Developing efficient extraction techniques is crucial for detecting trace contaminants in water.

Purpose of the Study:

• To develop and evaluate a novel solid-phase extraction element for enhanced analyte enrichment.
• To assess the performance of the new element for analyzing the herbicide bethrodine in water samples.

Main Methods:

• A titanium open tubular tube coated with polydimethylsiloxane (PDMS) was used as the novel extraction element.
• The extraction element was coupled with thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) for analysis.
• Analysis of the herbicide bethrodine in water samples was performed over a wide concentration range.

Main Results:

• High extraction efficiencies were achieved due to the larger PDMS absorbent volume.
• A good linearity (R²=0.992) was observed for bethrodine concentrations from 2.5 to 2.5 x 10⁴ ng/l.
• A low detection limit of 0.5 ng/l and good reproducibility (RSD < 7.5%) were demonstrated.

Conclusions:

• The novel PDMS-coated solid-phase extraction element provides an efficient and sensitive method for trace herbicide analysis.
• This technique is suitable for the quantitative determination of herbicides in environmental water samples.
• The developed method offers advantages over conventional SPME in terms of extraction capacity and sensitivity.