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Simultaneous quantification of aqueous peroxide, nitrate, and nitrite during the plasma–liquid interactions by derivative absorption spectrophotometry

A derivative absorption spectroscopic method is used in situ to simultaneously trace and quantify the aqueous peroxide (H2O2), nitrate (NO3−) and nitrite (NO2−) generated during plasma–liquid interactions. The results indicate that the time evolutions of H2O2, NO3− and NO2− generated from the plasma–liquid interactions strongly depend on the solution’s pH value, which varies with the plasma treatment. The concentrations of aqueous H2O2, NO3− and NO2− increase independently from each other during the plasma treatment when the solution’s pH value is higher than 3.0. However, when the solution’s pH value is less than 3.0, most of the aqueous NO2− (~71.5%) will exist in the form of molecular nitrous acid since the pKa of nitrous acid is 3.4, the aqueous NO3− is mainly formed from the reaction between H2O2 and NO2− as well as the decomposition of molecular HNO2, which leads to a continuous increase of NO3− concentration and an appearance of the maximum concentrations of H2O2 and NO2− as the pH value of the solution reaches 3.0.