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首页> 外文期刊>Eurasian Soil Science >Distribution and Mobility of Radiocesium in Relation to the Clay Fraction Mineralogy and Soil Properties in the Iput River Floodplain
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Distribution and Mobility of Radiocesium in Relation to the Clay Fraction Mineralogy and Soil Properties in the Iput River Floodplain

机译：伊特河漫滩中放射性铯的分布和迁移率与粘土组分矿物学和土壤性质的关系。

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摘要

The role of the mineralogy of the clay fraction and the physicochemical properties of alluvial soils in the floodplain of the Iput River and its tributary the Buldynka River (in the region of the settlement of Starye Bobovichi in Bryansk oblast) in the distribution and immobilization of radioactive isotope ~(137)Cs from the atmospheric fallout after the Chernobyl accident was studied. The soils had a sandy texture; a significant variation in the content of amorphous iron oxides (0.1-0.77%) and labilemanganese (11.2-193 mg/kg), the cation exchange capacity (6.1-54.2 meq/100 g soil), and the base saturation (29-100%) was common; an appreciable content of X-ray amorphous mineral substances in the clay fraction (<1 u,m) enriched with organic carbon (7.7-13.1%); the predominance of trioctahedral hydromicas (Me = 50%) in the clay fraction; and the presence of fine-disperse quartz and lepidocrocite. The specific activity of the ~(137)Cs in the clay fraction of the moderately and strongly contaminated layers increased with the increasing portion of smectite formations and (or) hydro-micas. On the whole, the presence of the clay fraction favored a decrease in the ~(137)Cs mobility (the correlation between its content and that of exchangeable cesium was r= -0.608, n = 17). However, the portion of exchangeable radiocesium (extracted with 1 M CH_3COONH_4,1 :10) had a tendency toward an increase with increasing content of hydromicas in the clay fraction. Thus, the minerals of this group were a potential source of exchangeable ~(137)Cs in the soils. The significant role of amorphous and mobile iron forms in the immobilization and migration of radiocesium in the secondary contaminated horizons of the alluvial soils was revealed.
机译：伊特河及其支流布尔丁卡河（在布良斯克州Starye Bobovichi的定居点地区）的黏土部分的矿物学和冲积土的理化性质在放射性的分布和固定中的作用研究了切尔诺贝利事故后大气沉降的同位素〜（137）Cs。土壤有沙质质感。非晶态氧化铁（0.1-0.77％）和不稳定锰（11.2-193 mg / kg），阳离子交换容量（6.1-54.2 meq / 100 g土壤）和碱饱和度（29-100）的显着变化％）很常见;富含有机碳（7.7-13.1％）的粘土级分（<1 u，m）中有相当数量的X射线无定形矿物物质;粘土级分中八面体的虹膜菌（Me = 50％）占优势;以及细分散的石英和纤铁矿的存在。中度和重度污染层的粘土组分中〜（137）Cs的比活度随蒙皂石地层和（或）积水云母的增加而增加。总体而言，粘土级分的存在有利于〜（137）Cs迁移率的降低（其含量与可交换铯的相关性为r = -0.608，n = 17）。然而，可交换的放射性铯的部分（用1 M CH_3COONH_4,1：10萃取）具有随着粘土级分中水mic的含量增加而增加的趋势。因此，这组矿物是土壤中可交换〜（137）Cs的潜在来源。揭示了无定形和活动铁的形式在放射性土壤次生污染层中放射性铯的固定和迁移中的重要作用。

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