Using atmospheric CCl4 as an internal reference in gas standard preparation

Jia Lin Wang, Wen Chain Lin, Tai Yih Chen

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

This study investigates the feasibility of using CCl4 in the background air as a concentration reference to calibrate synthetic mixtures. A metal vacuum line was constructed for preparing diluted standard mixtures at parts per billion by volume (ppbv) or trillion by volume levels (pptv) from pure substance. Component mixing ratios in the synthetic air were roughly estimated based upon the volume and pressure changes between the dilution glass bulbs on the vacuum line. More accurate estimates of the dilution factors relied on calibrating the absolute concentration of CCl4 in the synthetic mixture, acting as a surrogate, against its atmospheric levels. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)4393-4398
Number of pages6
JournalAtmospheric Environment
Volume34
Issue number25
DOIs
StatePublished - 26 Jul 2000

Keywords

  • Dilution
  • Surrogate
  • Variability
  • Volatile organic compounds

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