Abstract
The results are given of an investigation of the changes in the physicochemical properties of the chromophores of lignin substances of effluents by photopotential, luminescence, and ESR spectroscopy and the polarographic determination of oxygen as a function of the number of quanta of incident energy in the interval from 300 to 600 nm. It has been established that under the action of light a change in the redox properties, an increase in the rate of consumption of oxygen, the formation of radical intermediate products, and the appearance of excited triplet states of the lignin chromophores take place in the lignin substances. Action spectra of the photopotential, of the yield of EPCs of free radicals, and of the consumption of oxygen by the lignin substances in the interval from 300 to 600 nm have been obtained.
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Siberian Scientific-Research Institute of Cellulose and Board Bratsk. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 269–274, March–April, 1987.
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Chupka, É.I., Rykova, T.M. Photophysical and photochemical properties of lignin chromophores in aqueous systems. Chem Nat Compd 23, 226–230 (1987). https://doi.org/10.1007/BF00598765
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DOI: https://doi.org/10.1007/BF00598765