E3S Web Conf.
Volume 265, 2021Actual Problems of Ecology and Environmental Management (APEEM 2021)
|Number of page(s)||7|
|Published online||03 June 2021|
Sorption of dissolved organic matter by freshwater bacterioplankton
1 Lomonosov Moscow State University, Department of Soil Science, Moscow 119991, Russia
2 Lomonosov Moscow State University, Department of Geology, Moscow 119991, Russia
* Corresponding author: email@example.com
Here we describe the study of the sorption of high-molecular components of dissolved organic matter (DOM) of natural waters - humic acids - by eight bacterial strains isolated from freshwater. Isotherms of DOM sorption by cells are described by the Langmuir equation. Gram-positive bacteria adsorb more DOM than gram-negative bacteria, with high molecular weight DOM fractions binding in a relatively selective manner. A high positive correlation (r = 0.91) was found between the decrease in the molecular weight of DOM during the sorption of these compounds by cells and the maximum sorption value. The formation of a polysaccharide capsule increases the binding of DOM by the cells of Pseudomonas sp. to the level of gram-positive bacteria.
© The Authors, published by EDP Sciences, 2021
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