Colorimetric determination of ambient ozone using indigo blue droplet

Journal of the Brazilian Chemical Society

Erika P. Felix¹  Arnaldo A. Cardoso¹ 

[1] ,Universidade Estadual Paulista Instituto de Química Araraquara SP ,Brazil

关键词: ozone;    colorimetric sensor;    optical fibers;    liquid droplet;   

DOI  :  10.1590/S0103-50532006000200012

来源: SciELO

【 摘 要 】

A simple and sensitive method based on a liquid droplet is described for the measurement of atmospheric ozone. A 30 µL drop of indigo blue solution is suspended in a flowing-air sampling stream. The ozone collected reacts with the indigo solution resulting in its decolorization. The colorimetric sensor is composed of two optical fibers and the source of monochromatic light was a red LED (625 nm). The calibration curve was constructed with ozone standard concentrations ranging from 37 - 123 ppbv. The detection limit achieved was 7.3 ppbv. The method considered here showed itself to be easy to apply with a fast response and a total analysis time of only 5 minutes.

【 授权许可】

CC BY   
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