|
ИСТИНА |
Войти в систему Регистрация |
ИСТИНА ИНХС РАН |
||
Granulometric and mineralogic investigation for explanation of radionuclide accumulation in different size fractions of the Yenisey floodplain soilsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 ноября 2014 г.
- Авторы: Korobova E.M., Linnik V.G., Chizhikova N.P., Alekseeva T.N., Shkinev V.M., Brown J., Dinu M.I.
- Журнал: Journal of Geochemical Exploration
- Том: 142
- Год издания: 2014
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 49
- Последняя страница: 59
- DOI: 10.1016/j.gexplo.2014.02.030
- Аннотация: A detailed study of soil fractions of different sizes and their mineralogy was performed to explain the distributions of Cs-137 discharged by the Krasnoyarsk MCC in alluvial soils of the near and remote impact zones. Radionuclides were shown to concentrate in fine fractions enriched in hydromica and smectite. However, in natural conditions the dominant size fractions responsible for Cs-137 accumulation appeared to belong to sizes from silt (0.010 mm) to clay (0.001 mm). Ultrasonic treatment helped to reveal that this occurs due to natural water-resistant aggregation of smaller particles. Aggregation of fine particles and a considerable contribution of coarse fractions to the total sample mass lead to a smoothing effect in the distribution of Cs-137 inventory in different fraction masses constituting the soil layer. However, clay fractions <0.001 mm, and aggregates sized 0.05(0.63)-0.010 mm and 0.25-0.125 mm appear to dominate in radiocesium storage in the studied layers supporting the contention that these fractions play a major role in the distribution and accumulation of technogenic contamination in the floodplain soils of the region. Mineralogical analysis of the samples proved that floodplain sediments are able to fixate cesium due to the presence of smectites, illite, feldspars and micas in fines and coarser fractions. Abundant feldspar transformed to sericite can also contribute to cesium sedimentation. The particle interval from <0.001 to 0.010 mm would appear to be crucial for contamination levels of river sediments and floodplain soils as they are comparatively resistant in aqueous solution and prone to easy transport by the river. Therefore the alluvial soil fractions of these sizes are of prime importance in the studies of technogenic contamination of river systems. (C) 2014 Elsevier B.V. All rights reserved.
- Добавил в систему: Линник Виталий Григорьевич