Multi-adsorbent preconcentration/focusing module for portable-GC/microsensor-array analysis of complex vapor mixtures

Chia-Jung Lu, Edward T. Zellers

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

A small multi-adsorbent preconcentration/focusing module for a portable GC with microsensor-array detector designed to determine complex mixtures of volatile and semi-volatile organic compounds encountered in indoor working environments is described. Candidate adsorbents were assessed on the basis of analyte thermal-desorption bandwidth and efficiency, chromatographic peak shape, and breakthrough volume against mixtures of organic compounds ranging over four orders of magnitude in vapor pressure. A capillary packed with just 12.3 mg of adsorbent material comprising Carbopack B (8 mg), Carbopack X (2.5 mg) and Carboxen 1000 (1.8 mg) provided the best tradeoff in operating variables, while maintaining sufficient capacity for a 1 L air sample containing a mixture of up to 43 compounds, each at 100 parts-per-billion, at an ambient relative humidity of up to 100%. On-column focusing and temperature programming were used to enhance chromatographic separations, and detection limits as low as 100 parts-per-trillion were achieved for a 1 L air sample using an integrated array of polymer-coated surface-acoustic-wave (SAW) sensors. Implications for field analysis of indoor air quality are emphasized.

Original languageEnglish
Pages (from-to)1061-1068
Number of pages8
JournalAnalyst
Volume127
Issue number8
DOIs
Publication statusPublished - 2002 Aug 1

Fingerprint

Microsensors
Complex Mixtures
Adsorbents
Vapors
Air
Indoor Air Pollution
Vapor Pressure
Volatile Organic Compounds
air
acoustic wave
indoor air
Humidity
vapor pressure
surface wave
volatile organic compound
Limit of Detection
relative humidity
organic compound
desorption
Polymers

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

Cite this

Multi-adsorbent preconcentration/focusing module for portable-GC/microsensor-array analysis of complex vapor mixtures. / Lu, Chia-Jung; Zellers, Edward T.

In: Analyst, Vol. 127, No. 8, 01.08.2002, p. 1061-1068.

Research output: Contribution to journalArticle

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