[Applications of large-volume injection for environmental analysis]

Area of Science:

• Analytical Chemistry
• Environmental Science

Context:

• Capillary gas chromatography (CGC) is crucial for trace component determination.
• Traditional methods often require extensive sample cleanup, increasing time and cost.
• On-line coupling of liquid chromatography (LC) with CGC offers enhanced analytical capabilities.

Purpose:

• To review recent advancements in Large-Volume Injection (LVI) techniques for capillary gas chromatography.
• To highlight LVI's role in environmental sample analysis and simplifying sample preparation.
• To discuss LVI methods enabling on-line coupling of LC with CGC.

Summary:

• Large-volume injection (LVI) in CGC utilizes specialized liners or retention gaps to introduce larger sample volumes.
• Key LVI features include sample retention and efficient solvent vapor elimination.
• This review details various LVI techniques such as on-column injection (OCI), programmed temperature vaporizer (PTV), and AT-column for environmental analysis.

Impact:

• LVI significantly reduces or eliminates the need for sample cleanup steps in environmental analysis.
• It enables the direct determination of trace components in complex environmental matrices.
• LVI facilitates the on-line connection of liquid chromatography (LC) with CGC, streamlining multi-dimensional chromatographic analyses.