Examination of UV-absorption spectroscopy for analysis of O3, NO2-, and HNO2 compositions and kinetics in plasma-activated water
Examination of UV-absorption spectroscopy for analysis of O3, NO2-, and HNO2 compositions and kinetics in plasma-activated water
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DOI：
10.35848/1347-4065/ab86fd
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发表时间：
2020-05-01
影响因子：
1.5
通讯作者：
Nakamura, Toshihiro
中科院分区：
文献类型：
--
作者：
Tachibana, Kunihide;Nakamura, Toshihiro
为了检验紫外吸收光谱作为分析等离子体活化水中活性氧和氮的工具，我们尝试通过识别深紫外和近紫外范围内吸收光谱的不同特征，根据水溶液的 pH 值来分离 NO2 和 HNO2 浓度。为了测量 O-3，我们使用两种方法检查了 260 nm 处的摩尔吸光系数 e。在第一种方法中，测量了脱气O-3从水中的吸收，而在第二种方法中，使用O-3与NO2-的水相反应，将O-3的减少与NO2-的减少和NO3-的增加进行比较。两种方法得出的 e 值略有不同，但与文献中常见的 3.0 x 10(3) M-1 cm(-1) 值的误差在 5% 以内。还估计了 NaNO2 水溶液中 O-3 的反应吸收。
To examine UV-absorption spectroscopy as a tool for the analysis of reactive oxygen and nitrogen species in plasma-activated water, we attempted to separate the NO2- and HNO2 concentrations depending on the pH value of aqueous solution by identifying their different features of absorption spectra within deep-UV and near-UV ranges. For the measurement of O-3, we examined the molar absorption coefficient e at 260 nm using two methods. In the first method, the absorption of degassed O-3 from water was measured, whereas in the second method, using an aqueous reaction of O-3 with NO2-, the decrease in O-3 was compared to the decrease in NO2- and increase in NO3-. The values of e derived from both methods were slightly different, but were within 5% of the value of 3.0 x 10(3) M-1 cm(-1), as commonly found in the literature. The reactive uptake of O-3 on aqueous solution of NaNO2 was also estimated.