Measurement of dissolved carbon dioxide using colorimetric polymer films

Andrew Mills; Lorraine Wild

doi:10.1117/12.229172

3 January 1995 Measurement of dissolved carbon dioxide using colorimetric polymer films

Andrew Mills, Lorraine Wild

Proceedings Volume 2631, Medical and Fiber Optic Sensors and Delivery Systems; (1995) https://doi.org/10.1117/12.229172
Event: BiOS Europe '95, 1995, Barcelona, Spain

Abstract

The hydrophobic bases tetradodecylammonium hydroxide (TDAOH) and tetrakisdecylammonium hydroxide (TKAOH) are to be used to solubilize the anionic form of m-cresol purple in ethyl cellulose to create a dry colorimetric thin polymer film sensor for CO₂ in the gas phase or dissolved in solution. When used in aqueous solution, both TDAOH and TKAOH appear significantly more resistant to interference by protons or other ions at high concentration when compared with tetraoctylammonium hydroxide (TOAOH), the hydrophobic base which has been used for such work in previous studies. The TDAOH films are used as carbon dioxide sensors in aqueous solution at high ionic strength (e.g. 1 mol dm^-3) and still appear blue at pH 1 after 1 h.

Citation Download Citation

Andrew Mills and Lorraine Wild "Measurement of dissolved carbon dioxide using colorimetric polymer films", Proc. SPIE 2631, Medical and Fiber Optic Sensors and Delivery Systems, (3 January 1995); https://doi.org/10.1117/12.229172

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