Construction and evaluation of automated gas chromatography for the measurement of anthropogenic halocarbons in the atmosphere

Jia Lin Wang, Chih Jong Chang, Wen Dur Chang, Clock Chew, Shin Wei Chen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

An automated gas chromatography system for analyzing atmospheric halocarbons was constructed and evaluated. A cryogenic trap was developed to facilitate automation and, at the same time, conserve liquid nitrogen. Concentration calibration was accomplished by the use of multi-component gas mixtures with ambient concentration levels. Reproducibility was evaluated with replicate precision of about 1-2% for most of the measured halocarbons, substantially better than that of our previous manual system of 4-6%. The linearity of this automated system was confirmed by two independent methods, with one varying injection volume and the other varying injection concentration, and both were in excellent agreement. The system was successfully employed in canister and in-situ measurements. Concentrations of CCl4 was found to be extremely uniform with average concentration of 102 pp (v/v), very close to its global background value. The standard deviation of 106 samples was 1.5% for CCl4 which is almost equivalent to its analytical precision. This uniform property associated with CCl4 atmospheric distribution can be a useful tool for testing system's reproducibility and stability. Copyright (C) 1999 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)259-269
Number of pages11
JournalJournal of Chromatography A
Volume844
Issue number1-2
DOIs
StatePublished - 4 Jun 1999

Keywords

  • Air analysis
  • Automation
  • Environmental analysis
  • Halocarbons
  • Instrumentation
  • Organochlorine compounds

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