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POSSIBILITY OF USING PERMANGANATE-OXIDIZED CARBON AS AN INDICATOR OF WELLBEING OF RIVER BOTTOM SEDIMENTS AND SOILS OF RIVER CATCHMENT AREAS
Abstract
The article discusses the possibility of using permanganate oxidizable carbon (POxC, active carbon) as a comprehensive indicator for assessing the state of oil contaminated soils and bottom sediments. POxC has recently emerged as a standardized indicator of active, labile carbon within soil quality frameworks. According to the study, the application of this indicator of the ecological wellbeing of water body is possible since bottom sediments and soils are complex natural biogeochemical barrier zones. Bottom sediments determine such intra-basin processes as decomposition, accumulation and release of organic matter, oxygen consumption, creation of an environment for sustainable functioning of communities of microorganisms, etc. POxC in turn is representative of most of the chemical, physical and biological functions of bottom sediments. Small rivers Graevka and Primorskaya were taken as objects of research because the catchments of this waterbodies are located in area of intense anthropogenic impact. The excess of the content of oil products in bottom sediments and soils of the catchment areas of these rivers has been repeatedly mentioned. Results of studies carried out in 2020-2021 show that the pollution tendency persists. For one, if in 2012 the average content of oil products in bottom sediments of the Graevka River was 2 mg/kg, then in 2020 and 2021 it was already 3.5 and 3.9 mg/kg respectively. In the bottom sediments of the Primorskaya River, the concentration of oil products increased to 4.5 and 4.6 mg/kg in 2020-2021. Studies of the bottom sediments shows that there is a significant inverse correlation (r = -0.767) between oil content and active carbon content. For soils of catchment areas located in the impact zone of motor roads, the correlation coefficient was r = -0.832
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