New alternative method of benzo[a]pyrene extractionfrom soils and its approbation in soil under technogenic pressure
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The optimization of benzo[a]pyrene extraction conditions by subcritical water extraction method from soils is the purpose of the research. The optimal conditions for benzo[a]pyrene recovery are 30-min extraction by water in a special steel cartridge at 250 °C and 100 atm.
Materials and methods
Studies were conducted on the soils of monitoring plots subjected to Novocherkassk Power Station emissions. Monitoring plots were established at different distances from the Novocherkassk Power Station (NPS; 1.0–20.0 km).
Results and discussion
It was shown that the use of water in subcritical state as a solvent for benzo[a]pyrene extraction from soil allows to avoid large volumes of organic solvents and to decrease the time of sample preparation. It is shown that the maximum benzo[a]pyrene maintenance was observed in soils of the monitoring plots located most close (to 5 km) to a pollution source in the area of the prevailing direction of a wind rose. Dynamics of pollutant accumulation in soils depend on number of Novocherkassk state district power station emissions.
The method of benzo[a]pyrene subcritical water extraction from soil was developed and approbated during long-term monitoring researches of technogenic polluted territories. The optimum conditions for benzo[a]pyrene extraction from soil have been determined: the soil is treating by subcritical water at 250 °C and 100 atm of pressure for 30 min. Trends in the accumulation of benzo[a]pyrene in soil zones of the thermal power plant influence have been researched over a 5-year period of monitoring observations by subcritical water extraction method. Benzo[a]pyrene accumulation in soils depends on the technogenic emissions to the atmosphere from Novocherkassk power station and on the soil physical and chemical properties.
KeywordsBenzo[a]pyrene Extraction Monitoring Soil Subcritical water
This research was supported by projects of the Ministry of Education and Science of Russia, no. 5.885.2014/К, Grant of President of Russian Federation no. MK 6827.2015.4 and Scientific Research Grant (TUBITAK-1110698) from The Scientific and Technological Research Council of Turkey. Analytical work was carried out on the equipment of Centers for collective use of Southern Federal University “High Technology”, grant RFMEFI59414X0002, “Biotechnology, Biomedical and Environmental Monitoring”.
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