Abstract
AbstractTo fit a specific application, a cheap and effective manner of measurement of chemistries in plasma‐activated water (PAW) is in demand. We propose a digital colorimetry‐based method of quantifying the long‐lived species in PAW using only smartphones and specialized software. Pin−plate discharge and surface microdischarge were used to generate the PAWs. H2O2 and NO2− were selected as representatives for the test. Various color parameters were extracted from images of a solution consisting of testing species and colorimetric reagent. Specialized curve‐fitting strategies were developed during data processing. The results were consistent with those measured by UV–Vis spectrometry, but they provided better performance and simplified operation. Additionally, the proposed PAW generator design can be integrated with the detecting module based on this method.
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