Abstract
Soil pollution with heavy metals not only reduces crop yields, but also negatively affects human and animal health. Even such a biophilic element as Zn, when excessively supplied to living organisms, has a toxic effect. The introduction of sorbents into the soil makes it possible to ensure the binding of pollutants in situ, leading to a decrease in their mobility and biological availability. In the course of the work, the efficiency of application and the physicochemical characteristics of organic carbonaceous sorbents, granular activated carbon (GAC) of commercial production and biochar obtained from regional agricultural waste (rice husk) were investigated and compared, which determine their adsorption capacity with respect to Zn ions. Under the conditions of a model experiment, metal inactivation was shown in contaminated soils when using carbonaceous sorbents. Due to the high sorption properties of GAC and biochar, a decrease in the content of all mobile forms (exchange, complex and specifically sorbed) of Zn compounds in contaminated soils, was found. The most effective dose for reducing the mobility of metal ions in the soil was 5% of the soil mass for both biochar and GAC.
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