利用氧化还原滴定法检测了强电离放电等离子体中活性物种,用以衡量等离子体的表观氧化能力. 分别考察了pH值、放电气体流量、放电功率、放电气体压力、反应时间等因素对检测的影响. 在pH=6.0,反应时间3 min优化条件下,随放电功率增加,等离子体中活性物种浓度增加;放电气体流量增加,等离子体中活性物种浓度下降;放电气体压力增加,等离子体中活性物种浓度增加. 方法设备简单、再现性好,灵敏度高,检出限为3.91×10~(-5) mol/L.
A method was developed to determine the concentration of activated species in strong ionized discharging plasma, which could be used to measure the apparent oxidation ability. In the experiments, the excess ferrous ions reacted with the activated species in plasma, and then the remained ferrous ions was titrated with potassium permanganate, the amount of which was used to determine the concentration of the activated species. Some influencing factors, such as pH value, flow of discharging gas, discharging power, pressure of discharging gas and reaction time, were evaluated, respectively. The results of experiments show that pH = 6. 0 was the proper initial pH value; the reaction time had less effect on the determination, so 3 minutes was suitable; the concentration of the activated species increased with the increases of discharging power and the pressure of discharging gas, but decreased with the increase of the flow of discharging gas. It has shown that the reproducibility and the sensitivity of the determination method are all satisfied, and the detection limit reaches 3. 91 × 10~(-5) mol/L.
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