IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Effects of plant growth and organic carbon addition on DDE degradation in soil
Autor/es:
DI LENOLA M; FRANCESCA MARÍA MITTON; MIGLIORANZA K.; BARRA CARACCIOLO A; ADEMOLLO L; GRENNI P; CARDONI M; PATROLECCO L; GONZALEZ M.
Reunión:
Congreso; SETAC Europe 2018; 2018
Resumen:
Although the use of DDT was banned in numerous Countries several years ago,owing to its high lipophilicity and persistence, this pesticide and its metabolites(p´p´-DDE and p´p´-DDD) are frequently found in the environment. Plant-assistedbioremediation can be a promising clean-up technology to contaminated soilremediation; it relies on the synergistic action between plant rhizosphere andmicroorganisms to remove toxic substances. In this work, Solanum lycopersicumtogether with dissolved organic carbon were added to DDE contaminated soil forbioremediation purposes in greenhouse microcosms. The experimental set was performed to assess the effectiveness on DDE biodegradation of tomato plantpresence with and without the addition of two different DOC (with different humicsubstance composition). The pots were filled with contaminated soil (1 ppm ofDDE) in presence/absence of tomato plants and watered with different kinds ofDOC solutions; control soils (with/without plant and/or DDE) were alsoimplemented. The plots were sampled after 40 days from DDE exposure. Theeffects of the different treatments on the natural microbial community and on DDEbiodegradation ability were evaluated in terms of microbial abundance, viability,structure, dehydrogenase activity and DDE residual concentration. The resultsshowed that the plant presence stimulated the overall soil microbial communityactivity but did not increase significantly the DDE biodegradation. The quality ofthe organic carbon in terms of fulvic and humic acids presence influenceddifferently both DDE degradation and microbial activity.