Study of Detoxifying Ability of Oxidized Humic Substances under the Conditions of Oil Pollution of Soils
The article presents the results of research on the oxidative modification of humic substances of brown coal of the Tyulgan deposit. The detoxifying effect of the obtained substances in relation to petroleum hydrocarbons was studied using the bioassay method. During the evaluation, a noticeable increase in the detoxifying ability was found in the result of chemical modification of humic substances. The greatest detoxifying effect in relation to oil pollution of the soil was observed for humic substances modified by oxidation and amounted to 19 and 42% at doses of 0.01 and 0.1% by weight. accordingly. The detoxifying effect of native humic substances is significantly lower: 9 and 2 % at doses of 0.01% and 0.1% by weight. accordingly. Thus, the prospects of using oxidized humic substances as sorbents-detoxicants during phytoremediation of oil-contaminated soil are shown.