Mills, A. and Grosshans, P. and Snadden, E. (2009) Hydrogen peroxide vapour indicator. Sensors and Actuators B: Chemical, 136 (2). pp. 458-463. ISSN 0925-4005Full text not available in this repository. (Request a copy from the Strathclyde author)
A hydrogen peroxide vapour indicator is described comprising a triarylmethane dye, lissamine green (LG), dissolved in a polymer, polyvinyl alcohol (PVA). The indicator is green/blue in the absence of hydrogen peroxide vapour but is rapidly bleached in the presence of hydrogen peroxide vapour. The kinetics of LG bleaching appear approximately first order with respect [LG] and the concentration of H2O2, which, in turn, is proportional to the partial pressure of H2O2. However, the kinetics also appear to depend directly upon the reciprocal of the film thickness, implying some dependence upon the diffusion of the H2O2 vapour through the indicator film. Like most other H2O2 indicator films (such as starch-iodide paper), the LG/PVA indicator is not particularly selective and responds to most other volatile strong oxidising agents, such as ozone and chlorine. However, it is rapid in response (<5 min) and easy to use and has potential as a simple indicator of strong oxidising agents; in particular it may be used to screen the headspace above liquids for H2O2, which can be used for making in situ explosives, such as triacetone triperoxide (TATP).
|Keywords:||indicator, Hydrogen peroxide, Lissamine green, Triarylmethane, Vapour, TATP, Physical and theoretical chemistry, Materials Chemistry, Instrumentation, Surfaces, Coatings and Films, Metals and Alloys, Electronic, Optical and Magnetic Materials, Electrical and Electronic Engineering, Condensed Matter Physics|
|Subjects:||Science > Chemistry > Physical and theoretical chemistry|
|Department:||Faculty of Science > Pure and Applied Chemistry|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||17 May 2010 13:52|
|Last modified:||04 May 2016 15:58|