Abstract
It was recently reported that when using polychromatic light sources, a photon-based approach should be used to determine photochemical parameters instead of an energy-based approach, and that failure to do so would lead to errors. To illustrate whether the errors could be significant, the quantum yield of atrazine photolysis was determined by measuring its decomposition rate using a medium pressure UV lamp. The results showed that the use of the previously-reported method to calculate quantum yield introduced a 9% error. Furthermore, simplification of the equation via expanding the fraction of light absorbed as a Taylor series as previously-reported introduced a 3% error. The errors would be more significant when the photolyzed compound has a higher concentration or has a broader absorption spectrum.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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