Pulsed Cathodoluminescence of Gallic Acid in Solid Mixtures with Humic Acids

The pulsed cathodoluminescence (PCL) spectra of mixtures of gallic acid with humic acids of various origins (10, 30, 50, 70, and 90 wt.%) were studied. PCL spectra were recorded in the range from 350 to 850 nm after irradiation with an electron beam duration of 2 ns and with an average energy of 170 keV. The number of irradiation pulses at a repetition rate of 1 Hz varied from 20 to 4000. In many mixtures, PCL was absent or had very low intensity. In those mixtures where luminescence was recorded, the spectrum differed from the spectrum of gallic acid in the absence of humic acids and corresponded to the luminescence of its base form. Gallic acid was shown to be incorporated into the humic acid structure, forming hydrogen-bonded complexes.

1. С. Я. Соколов. Фитотерапия и фитофармакология: руководство для врачей, Москва, ООО “Мед. информ. агентство” (2000)

2. Д. А. Муравьева. Фармакогнозия, Москва, Медицина (1978)

3. S. Chianese, A. Fenti, P. Iovino, D. Musmarra, S. Salvestrini. Molecules, 25 (2020) 918—935, https://doi.org/10.3390/molecules25040918

4. V. Leone, D. Musmarra, P. Iovino, S. Capasso. Water Air and Soil Poll., 228 (2017) 136—142, https://doi.org/10.1007/s11270-017-3321-9

5. F. J. Stevenson. Humus Chemistry: Genesis, Composition, Reactions, New York, Wiley (1994)

6. M. V. Lützow, I. Kögel-Knabner, K. Ekschmitt, E. Matzner, G. Guggenberger, B. Marschner, H Flessa. Eur. J. Soil Sci., 57 (2006) 426—445, https://doi.org/10.1111/j.1365-2389.2006.00809.x

7. О. Н. Чайковская, Л. В. Нечаев. Взаимодействие полициклических ароматических углеводородов с органическим веществом почв и водных осадков, Томск, Издательский Дом Томского государственного университета (2017)

8. А. В. Спирина, О. Н. Чайковская, Е. Н. Бочарникова, В. И. Соломонов, Н. В. Юдина. Журн. прикл. спектр., 93 (2026) 114—121 [A. V. Spirina, O. N. Tchaikovskaya, E. N. Bocharnikova, V. I. Solomonov, N. V. Yudina. J. Appl. Spectr., 93 (2026) 103—110]

9. E. V. Linkevich, N. V. Yudina A. V. Savel’eva. Solid Fuel Chem., 55 (2021) 332—337, https://doi.org/10.31857/S0023117721050042

10. V. I. Solomonov, S. G. Michailov, A. I. Lipchak, V. V. Osipov, V. G. Shpak, S. A. Shunailov, M. I. Yalandin, M. R Ulmaskulov. Laser Phys., 16 (2006) 126—129, https://doi.org/10.1134/S1054660X06010117

11. N. V. Yudina, A. V. Savel’eva, E. V. Linkevich. Solid Fuel Chem., 53 (2019) 29—35, https://doi.org/10.3103/S0361521919010099

12. T. S. Skripkina, A. L. Bychkov, V. D. Tikhova, O. I. Lomovsky. Solid Fuel Chem., 52 (2018) 356—360, https://doi.org/10.3103/S0361521918060101

13. T. S. Skripkina, A. L. Bychkov, V. D. Tikhova, B. S. Smolyakov, O. I. Lomovsky. Environ. Technol. Innov., 11 (2018) 74—82

14. A. V. Spirina, O. N. Tchaikovskaya, E. N. Bocharnikova, V. I. Solomonov, S. Yu. Sokovnin, M. E. Balesin. Rad. Phys. Chem., 247 (2026) 113991—113999, https://doi.org/10.1016/j.radphyschem.2026.113991