A method based on high performance liquid chromatography (HPLC), has been developed to measure hydroxyl radical ( Á OH) in plasma reactors. The determination was performed indirectly by detecting the products of the reaction of Á OH with salicylic acid (SAL). The applicability, and effect of time, specific input energy (SIE), relative humidity (RH), catalyst were investigated. It was found that 3 h was the optimal trapping time; concentration of Á OH was (5.9-23.6) 9 10 13 radicals/cm 3 at SIE range. The highest Á OH yield and toluene removal efficiency (g) were achieved with a RH of 20%. With MnO x , g was two times that without catalyst, while Á OH yield in gas stream was one-sixth that without catalyst. However, if summed with Á OH adsorbed on catalyst surface, the total Á OH yield was the same as without catalyst. Experiments performed with/without toluene allowed to determine the role of Á OH on decomposition of toluene in air plasma.
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