EQUILIBRIUM STUDIES ON COLORIMETRIC PLASTIC FILM SENSORS FOR CARBON-DIOXIDE

Andrew Mills, Q. Chang, N. Mcmurray

Research output: Contribution to journalArticlepeer-review

196 Citations (Scopus)

Abstract

The equilibrium responses of three new colorimetric plastic film sensors for CO2 as a function of % CO2 and temperature are described. The results fit a model in which there is a 1:1 equilibrium reaction between the deprotonated form of the dye (present in the film as an ion pair) and CO2. The 0-50% and 0-90% response and recovery times of each of these films when exposed to an alternating atmosphere of air and 5% CO2 are determined and in two cases are typically less than 3 s. The shelf life of the films is long (many months); however, prolonged use of the films leads to the permanent generation of the protonated form of the dye over a period of 20-100 h. A possible cause of this latter effect is discussed.
Original languageEnglish
Pages (from-to)1383-1389
Number of pages7
JournalAnalytical Chemistry
Volume64
Publication statusPublished - 1992

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