Oxidizing species generated during the plasma discharges in gas–water mixture are well reported for their potential applications in water disinfection. Ozone is an important oxidizing agent produced in these non-thermal plasmas. Present paper reports the spectrochemical analysis of ozone generated during pulsed plasma discharge in oxygen–water mixture. Ozone density in the plasma discharge channel was estimated by using absorption of incident ultraviolet radiation of a light emitting diode at 253.6 nm in the Hartley band of ozone. Based on UV absorption, the peak ozone density noted in the discharge channel was \((1.764 \pm 0.11) \times {10}^{16}/{\text{cm}}^{3}\). While the post plasma ozone density in the effluent water samples was determined through indigo method. The peak ozone density obtained by using this chemical probe was \((1.209 \pm 0.052) \times {10}^{16}/{\text{cm}}^{3}\), showing post plasma ozone depletion along the water flow. Moreover, ozone concentration was highly influenced by average discharge power and gas temperature and showed a decreasing trend with increase in these parameters. Presently, plasma discharge was also generated in aqueous solution of indigo trisulfonate and the resultant decolorization of known concentration of this dye was used to estimate the density of different oxidants in the discharge channel. Results showed that the estimated peak oxidant density in the discharge channel was \((3.818 \pm 0.087) \times 1{0}^{16}/{\text{cm}}^{3}\). While the energy yield of the plasma discharge for decolorization of indigo trisulfonate was \((148.905 \pm 16.314)\text{ g}/\text{kWh}\) with indigo decolorization efficiency of 79.261 ± 1.842%.

气体-水混合物中等离子体放电过程中产生的氧化物质因其在水消毒中的潜在应用而被广泛报道。臭氧是在这些非热等离子体中产生的重要氧化剂。本论文报告了氧-水混合物中脉冲等离子体放电过程中产生的臭氧的光谱化学分析。等离子体放电通道中的臭氧密度通过使用发光二极管在臭氧的哈特利波段中在 253.6 nm 处的入射紫外辐射的吸收来估计。基于紫外吸收，放电通道中的臭氧峰值浓度为\((1.764 \pm 0.11) \times {10}^{16}/{\text{cm}}^{3}\). 而出水样品中的等离子体后臭氧浓度是通过靛蓝法测定的。使用该化学探针获得的臭氧峰值浓度为\((1.209 \pm 0.052) \times {10}^{16}/{\text{cm}}^{3}\)，表明后等离子体臭氧消耗沿水流。此外，臭氧浓度受平均放电功率和气体温度的影响很大，并且随着这些参数的增加呈下降趋势。目前，在靛蓝三磺酸盐的水溶液中也产生了等离子体放电，并利用已知浓度的这种染料的脱色结果来估计放电通道中不同氧化剂的密度。结果表明，放电通道中估计的峰值氧化剂浓度为\((3.818 \pm 0.087) \times 1{0}^{16}/{\text{cm}}^{3}\)。而用于靛蓝三磺酸盐脱色的等离子体放电的能量产率为\((148.905 \pm 16.314)\text{ g}/\text{kWh}\)，靛蓝脱色效率为79.261±1.842%。