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Yang, Y.; Zhang, N.; Xue, M.; Lu, S.T.; Tao, S.
Environmental pollution (1987), 02/2011, Letnik: 159, Številka: 2Journal Article
The microbial activity in soils was a critical factor governing the degradation of organic micro-pollutants. The present study was conducted to analyze the effects of soil organic matter on the development of degradation potentials for polycyclic aromatic hydrocarbons (PAHs). Most of the degradation kinetics for PAHs by the indigenous microorganisms developed in soils can be fitted with the Logistic growth models. The microbial activities were relatively lower in the soils with the lowest and highest organic matter content, which were likely due to the nutrition limit and PAH sequestration. The microbial activities developed in humic acid (HA) were much higher than those developed in humin, which was demonstrated to be able to sequester organic pollutants stronger. The results suggested that the nutrition support and sequestration were the two major mechanisms, that soil organic matter influenced the development of microbial PAHs degradation potentials. ► PAH degradation kinetics obey Logistic model. ► Degradation potentials depend on soil organic carbon content. ► Humin inhibits the development of PAH degradation activity. ► Nutrition support and sequestration regulate microbial degradation capacity. Soil organic matter regulated PAH degradation potentials through nutrition support and sequestration.
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