INVESTIGADORES
MIGLIORANZA Karina Silvia Beatriz
artículos
Título:
Assessment of tolerance and efficiency of crop species in the phytoremediation of DDT polluted soils
Autor/es:
MITTON, FRANCESCA; MIGLIORANZA KARINA SILVIA BEATRIZ; GONZALEZ MARIANA; SHIMABUKURO VALERIA; MONSERRAT JOSE M
Revista:
ECOLOGICAL ENGINEERING
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2014 p. 501 - 508
ISSN:
0925-8574
Resumen:
Soil contamination by organic compounds is of great concern worldwide
since it could act as a major environmental repository. The success of
phytoremediation is conditioned by two main factors: the availability
and toxicity of the compound to be remediated, and the plant species
ability to incorporate or degrade the contaminants. This study aimed to
assess the potential of different plants species for remediation of aged
DDTs residues in soil. Tomato, sunflower, soybean and alfalfa plants
were grown in contaminated soils (p,p′-DDE 455.3, p,p′-DDT 63.5 ng g−1
dry weight) for 15 and 60 days. Phytoremediation was evaluated by
studying the pollutant dynamics in the soil?plant system and lipid
peroxidation (LPO) as an effect biomarker. Results showed that soil DDTs
levels were diminished after 60 days of plant growth, due to the
combined effect of DDTs uptake by roots and rhizospheric degradation.
The relative accumulation of each compound was dependent on soil levels (p,p′-DDE > p,p′-DDT > p,p′-DDD)
and all species presented root >aerial accumulation pattern,
evidencing DDTs translocation. Tomato plants were the most effective in
the enhancement of pollutants bioavailability in the rizospheric soil.
Plants growth induced physicochemical changes in soil and those are
evidenced by increasing dehydrogenase activity and DDTs metabolism,
mainly in soybean and tomato soil fractions. Root bioconcentration
factors >1 were observed in 15 days tomato and alfalfa plants. Growth
dilution effect was observed in roots of all species at 60 days, except
soybean. DDTs uptake nor affected tomato and alfalfa plants growth
neither caused oxidative stress. Considering the accumulation potential,
tolerance (expressed as no evident phytotoxicity effects) and
interaction with soil matrix in terms of metabolism and availability,
tomato plants seems to be the best phytoremediator candidates for aged
soil DDTs residues.