INVESTIGADORES
DELL'ARCIPRETE Maria Laura
congresos y reuniones científicas
Título:
Reactivity of singlet oxygen with neonicotinoid insecticides: mechanism and changes in toxicity
Autor/es:
M. L. DELL'ARCIPRETE; L. SANTOS-JUANES; A. ARQUES; A. M. AMAT; D. O. MÁRTIRE; M. C. GONZALEZ
Lugar:
Toledo, Espana
Reunión:
Conferencia; International Conference of Photochemistry; 2009
Resumen:
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Pesticides are of environmental concern due to
the serious effect they produce on aquatic ecosystems, even at low
concentrations. These species might remain for long periods in water, where
they can react to generate by-products which could be expected to show
different biocompatibility than the parent compound. There are an important
number of reactive systems that can be found in natural waters. In particular,
the study of the reactivity of singlet oxygen (1O2) with
pesticides is interesting as they are highly oxidizing and may modify
substantially the structure of the organics. Under natural conditions the steady
state concentration of these radicals is <10-12 M and thus, mineralization or strong oxidation
is not expectable, and only primary photo-oxidation products are likely to be
found. With this background, we investigated the primary steps in the 1O2-driven
oxidation of imidacloprid, acetamiprid and thiacloprid which are a novel group
of insecticides increasingly employed because of their selective toxicity for
insects over vertebrates.