Regional specificity of radionuclide fixation in river basins due to soil petrology and mineralogyстатьяИсследовательская статья
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Аннотация:Abstract
Purpose The main goal of this research was to compare and
reveal the difference in the character of Cs-137 distribution
and fixation in fine fractions of alluvial soils formed by the
rivers draining areas of different geochemical origin with the
corresponding mineral composition of clay fraction and to
discuss the results in light of possible ecological perspectives.
Materials and methods Alluvial soil samples were collected
in the Yenisey (Central Siberia) and Iput (the East European
Plain) river basin areas contaminated by 137Cs. Granulometric
fine fractions (>0.01, 0.01–0.005, 0.005–0.001, <0,001 mm)
were obtained by pipette technique; clay minerals were determined by a universal Carl-Zeiss Jena X-ray diffractometer
(Germany); and 137Cs activity was measured by a
CANBERRA gamma spectrometer with HPGe detector
(USA).
Results and discussion Clay mineralogy demonstrated regional specificity of its composition due to different origins
of the soil-forming rocks. Clay fraction of alluvial soil samples
collected in the Yenisey river floodplain consists mainly of
chlorite-vermiculite and chlorite-smectite interstratifications
while in the Iput river basin it is mainly composed of
hydromicas and mica-smectite interstratifications. We infer
that this may result in a higher potential ability of clay fraction
for the radionuclide exchange and release in the former region.
Conclusions Specificity of local clay minerals as radionuclide sorbents should be of particular ecological concern in relation to long-term exchange processes and
involvement of the radioisotope in local biogeochemical
cycles including its transfer to food chains. The phenomenon is considered in light of the developed scientific field inaugurated as petro-mineralogical ecology
and needs further investigation.
Keywords Chlorite . Ecological rating of clay minerals .
Mica . Petro-mineralogical ecology . Radiocesium .
Smectites . Vermiculite