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Environ Sci Pollut Res Int ; 25(3): 2594-2602, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29128946

RESUMO

Chemical analysis of soils contaminated with coal tar indicated that most organic compounds, and particularly PAHs, were contained in coarser particles (> 200 µm). Microscopic observations of this fraction, carried out on polished sections, reported the presence of organic particles in addition to mineral particles. Some organic particles had a very low porosity, and their microstructure did not evolve during biotreatment. Alternatively, other organic particles had a large porosity composed of an interconnected pore network that was open to coal tar surface and thus in contact with soil water. Interconnected porosity seemed to increase during biotreatment in relation to a decrease in the amount of organic compounds. The amount of open porosity in contact with soil water was expected to increase the desorption rate of PAHs. Consequently, the environmental hazard could depend on the amount of open porosity in addition to chemical properties of organic particles, such as their concentration in PAHs. Thus, microscopy can be complementary to chemical analysis and ecotoxicological assays to assess the best strategy for remediation but also to follow the advancement of a biotreatment.


Assuntos
Alcatrão/química , Ecotoxicologia/métodos , Monitoramento Ambiental/métodos , Substâncias Perigosas/análise , Microscopia , Poluentes do Solo/análise , Solo/química , Ecotoxicologia/instrumentação , Monitoramento Ambiental/instrumentação , Hidrocarbonetos Policíclicos Aromáticos/análise
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