Investigation of fulvic acid photochemistry in aqueous solutions by stationary and laser flash photolysis techniques |
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| Authors: | M. P. Makunina I. P. Pozdnyakov V. P. Grivin V. F. Plyusnin |
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| Affiliation: | 1. Voevodsky Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, Institutskaya ul. 3, Novosibirsk, 630090, Russia
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| Abstract: | Photochemistry of fulvic acid (FA, Henan ChangSneng Corporation) in aqueous solutions was studied using stationary and nanosecond laser (355 nm) flash photolysis. UV-excitation leads to formation of FA triplet state which is characterized by wide unstructured absorption band with maximum at 620 nm. The yield of FA triplet state depends on pH: intermediate absorption signal is maximal at neutral pH (6–7) and decreases in basic and acidic media. Kinetics of triplet state decay does not depend on solution pH and exhibits multiexponential character with characteristic times t 1 = 4.3 ± 2.2, t 2 = 54 ± 28, t 3 = 830 ± 240 μs. |
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