A mini-fluidic ultraviolet (UV) photoreaction system (MUPS) has been developed for bench-scale photochemical studies. While ensuring a high accuracy in UV fluence measurements, the MUPS can also increase the maximal available fluence rate (FR) by ∼100-fold (i.e., similar to the practical FRs existing in engineering applications), as compared to the commonly used quasi -collimated beam apparatus, and measure sample absorbance online. Photolysis experiments with two chemical actinometers (KI/KIO 3 and atrazine) demonstrate that the MUPS can easily be applied to photochemical studies in both low (<100 mJ/cm 2 ) and high (≥100 mJ/cm 2 ) fluence ranges with accurate quantifications of FR and exposure time; in addition, online absorbance measurements greatly facilitate the determination of photochemical parameters (e.g., rate constants and quantum yields).
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Li et al. (2015) studied this question.
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