In-line coupling headspace liquid-phase microextraction with capillary electrophoresis.

Area of Science:

• Analytical Chemistry
• Separation Science
• Environmental Analysis

Background:

• Volatile analytes require efficient preconcentration and determination methods.
• Traditional methods can be time-consuming and complex.
• Capillary electrophoresis (CE) offers high separation efficiency but often needs sample preconcentration.

Purpose of the Study:

• To develop and validate an in-line coupled headspace liquid-phase microextraction (HS-LPME) with capillary electrophoresis (CE) system.
• To determine volatile analytes in aqueous samples.
• To optimize extraction parameters for enhanced sensitivity and efficiency.

Main Methods:

• In-line coupling of HS-LPME with CE using a specialized sample vial cover.
• Optimization of acceptor phase configuration, solution type/concentration, temperature, time, salt-out effect, and sample volume.
• Phenols were used as model analytes for method evaluation.

Main Results:

• Optimal enrichment factors ranging from 520 to 1270 were achieved.
• Limits of detection (LODs) were between 0.5 and 1 ng/mL for phenols.
• High recoveries (87.2%–92.7%) and low relative standard deviations (<5.7%) were obtained.
• Successful application to quantitative analysis of phenols in tap water.

Conclusions:

• The proposed HS-LPME-CE method is a simple, convenient, and reliable technique for preconcentration and determination of volatile analytes.
• The method demonstrates good performance for analyzing trace levels of phenols in real water samples.
• This approach offers a promising alternative for environmental monitoring and analysis.