New methodologies for the analysis of volatile compounds using needle traps. Applications to breath, atmospheric and water analysis

Authors

  • Mònica Alonso Universitat de Girona. Departament de Química. Àrea de Química Analítica
  • Anna Godayol Universitat de Girona. Departament de Química. Àrea de Química Analítica
  • Enriqueta Anticó Universitat de Girona. Departament de Química. Àrea de Química Analítica
  • Juan M. Sánchez Universitat de Girona. Departament de Química. Àrea de Química Analítica

Keywords:

Needle traps, headspace, breath analysis, atmospheric analysis, water analysis.

Abstract

A new preconcentration technique has been developed for the analysis of volatile compounds based on the use of needle traps. These traps are made of stainless steel needles filled with one or more adsorbents, allowing the preconcentration of the analytes inside the trap by passing a gas flow through the needle. The parameters affecting the sorption/desorption process have been assessed (e. g. needle and liner dimensions, injector temperature, splitless time, memory effects, and stability
inside the needle). For liquid samples, four different passive and active sampling methodologies were studied. The best results in terms of simplicity and sensitivity are obtained by sampling the headspace with various cycles of small fixed volume. Once the best analysis conditions of analysis were determined, the method was validated for gas and liquid samples. The results show that needle traps are a good methodology for analysing breath, atmospheric and liquid samples.

Keywords: Needle traps, headspace, breath analysis, atmospheric analysis, water analysis.

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Author Biography

Mònica Alonso, Universitat de Girona. Departament de Química. Àrea de Química Analítica

 

 

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Issue

No. 11 (2012)

Section

Articles

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