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"Muu" projekt KBFI,MG-5
KBFI,MG-5 "Bioavailability of key environmental pollutants in different environmental matrices: from quantification to mechanism (1.01.2007−31.12.2009)", Angela Ivask, Keemilise ja Bioloogilise Füüsika Instituut.
2008416
KBFI,MG-5
Bioavailability of key environmental pollutants in different environmental matrices: from quantification to mechanism
Bioavailability of key environmental pollutants in different environmental matrices: from quantification to mechanism
1.01.2007
31.12.2009
Teadus- ja arendusprojekt
Muu
ValdkondAlamvaldkondCERCS erialaFrascati Manual’i erialaProtsent
1. Bio- ja keskkonnateadused1.8. Keskkonnaseisundit ja keskkonnakaitset hõlmavad uuringudT270 Keskkonnatehnoloogia, reostuskontroll1.4. Maateadused ja sellega seotud keskkonnateadused (geoloogia, geofüüsika, mineroloogia, füüsiline geograafia ning teised geoteadused, meteoroloogia ja ning teised atmosfääriteadused, klimatoloogia, okeanograafia, vulkanoloogia, paleoökoloogia60,0
1. Bio- ja keskkonnateadused1.9. Keskkonnaohtlikke aineid käsitlevad uuringudP305 Keskkonnakeemia 1.3. Keemiateadused (keemia ja muud seotud teadused)40,0
AsutusRiikTüüp
Maj ja Tor Nessling Foundation
PerioodSumma
01.01.2007−31.12.2009718 290,00 EEK (45 907,10 EUR)
45 907,10 EUR
Maj ja Tor Nessling Foundation

The studies on environmental risk assessment of soils and sediments have shown that due to the sorption to solid matrix relatively small fraction of the total load of pollutants is bioavailable, i.e., in the form posing risk to living organisms. Our previous studies have indicated the presence of soil/sediment-sorbed but still bioavailable fraction of different environmental pollutants, which becomes available to living organisms only upon direct contact between the organism and solid matrix. For example, for heavy metals this "particle-bound bioavailable fraction" in soil may exceed the water-leached amount up to 2 orders of magnitude having thus a remarkable contribution to their environmental risk to soil organisms. In this study we will investigate the mechanisms behind and factors playing role in the particle-bound bioavailability of environmental pollutants (emphasis on heavy metals) in different ecosystems, primarily in soils and sediments. Luminescent/fluorescent recombinant bacterial sensors will be used to determine the bioavailable fraction of selected environmental pollutants. The factors, which most probably influence the particle-bound bioavailability and thus, will be studied, are: 1. Abiotic factors: sample composition (e.g., matrix, pH)2. Biotic factors: general properties of the organism, extracellular polymers/enzymes produced by soil microbes, microbial production of other substances changing the local environment (e.g., pH)In this study we expect to find out and explain mechanisms playing role in the bioavailability of key environmental pollutants in different environmental matrices (emphasis on solid matriced of soils and sediments). The results of this study would certainly add a new dimension and understanding to environmental risk assessment, which at the moment is mostly based on soil and sediment total and not on real bioavailable concentrations of pollutants. Clearing up the factors influencing bioavailability both from physico-chemical and biological side (i.e., action of living organisms) enables the development/refinement of models for the prediction of bioavailability in different ecosystems, primarily in soils and sediments, where bioavailability issues are most important providing thus, extremely valuable information for risk evaluation as well as remedial actions of contaminated sites.
The studies on environmental risk assessment of soils and sediments have shown that due to the sorption to solid matrix relatively small fraction of the total load of pollutants is bioavailable, i.e., in the form posing risk to living organisms. Our previous studies have indicated the presence of soil/sediment-sorbed but still bioavailable fraction of different environmental pollutants, which becomes available to living organisms only upon direct contact between the organism and solid matrix. For example, for heavy metals this "particle-bound bioavailable fraction" in soil may exceed the water-leached amount up to 2 orders of magnitude having thus a remarkable contribution to their environmental risk to soil organisms. In this study we will investigate the mechanisms behind and factors playing role in the particle-bound bioavailability of environmental pollutants (emphasis on heavy metals) in different ecosystems, primarily in soils and sediments. Luminescent/fluorescent recombinant bacterial sensors will be used to determine the bioavailable fraction of selected environmental pollutants. The factors, which most probably influence the particle-bound bioavailability and thus, will be studied, are: 1. Abiotic factors: sample composition (e.g., matrix, pH)2. Biotic factors: general properties of the organism, extracellular polymers/enzymes produced by soil microbes, microbial production of other substances changing the local environment (e.g., pH)In this study we expect to find out and explain mechanisms playing role in the bioavailability of key environmental pollutants in different environmental matrices (emphasis on solid matriced of soils and sediments). The results of this study would certainly add a new dimension and understanding to environmental risk assessment, which at the moment is mostly based on soil and sediment total and not on real bioavailable concentrations of pollutants. Clearing up the factors influencing bioavailability both from physico-chemical and biological side (i.e., action of living organisms) enables the development/refinement of models for the prediction of bioavailability in different ecosystems, primarily in soils and sediments, where bioavailability issues are most important providing thus, extremely valuable information for risk evaluation as well as remedial actions of contaminated sites.