Preparation and application of in-fibre internal standardization solid-phase microextraction.

Area of Science:

• Analytical Chemistry
• Environmental Science

Background:

• Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
• Accurate calibration is crucial for reliable quantitative analysis, especially in complex matrices.
• Existing standardization methods can be time-consuming and prone to errors.

Purpose of the Study:

• To develop and evaluate novel techniques for pre-loading internal standards onto SPME fibres.
• To assess the applicability of the in-fibre standardization method for field and in-vial sample analysis.
• To demonstrate the effectiveness of the method in compensating for matrix effects.

Main Methods:

• Investigated various techniques for loading internal standards onto non-porous SPME fibres.
• Evaluated headspace extraction (of standards in oil or pure) and syringe-fibre transfer methods.
• Assessed the reproducibility and reusability of standard generation vials.
• Applied the in-fibre standardization method to milk samples.

Main Results:

• Loading techniques were found to be dependent on the physical properties of the standards (volatile, semi-volatile, low volatility).
• Reproducibility of <5% RSD was achieved for low-volatility compounds.
• Standard generation vials demonstrated reusability for hundreds of analyses with minimal loss.
• Effective compensation for matrix effects was observed in milk samples.

Conclusions:

• The in-fibre standardization method offers a robust and efficient approach for quantitative analysis.
• The method is versatile, applicable to both field sampling and in-vial analysis.
• This technique significantly improves accuracy by mitigating matrix effects in complex samples.