Bañobre C, Diaz-Francés I, Scarabino F, Fornaro L, García-Tenorio R
Centro Universitario Regional del Este, Universidad de la República, Rocha, 27000, Uruguay.
Grupo Física Nuclear Aplicada, Universidad de Sevilla, Sevilla, 41012, Spain.
J Environ Radioact. 2020 Oct;222:106352. doi: 10.1016/j.jenvrad.2020.106352. Epub 2020 Jul 23.
This paper presents the levels and distribution of Po in different compartments of a coastal lagoon on the east coast of Uruguay (South America). Activity concentrations of Po have been obtained in different matrices, such as water, superficial sediments, clams (Diplodon sp.), freshwaters snails (Pomacea sp.), zooplankton, and fishes (Jenynsia sp.), collected at different points of the lagoon and during several sampling campaigns. In addition, the organic matter content of the sediment was determined to study the variation of Po along the lagoon. The activity concentrations of Po in the water samples are in the range between 1.1 ± 0.2-3.5 ± 0.4 mBq/L while in the sediment samples vary between 17.1 ± 1.4 and 540 ± 12 Bq/kg, DW. In the case of biota, the ranges obtained were 182 ± 5-265 ± 6 Bq/kg, DW in clams and 134 ± 4-1245 ± 16 Bq/kg, DW in snail samples. A good correlation of Po with the organic fractions of the sediment was observed (r = 0.8798, p-value < 0.001), being obtained high values for the distribution coefficient Kd (10 -10). In the biota samples, a clear difference was observed in the Po concentration values in both species, mainly due to the different feeding habits of both aquatic organisms, as it is reflected in the associated concentration ratios (CR). In this paper, a good set of results of Po, Kd, and CR have been obtained in different matrices, enhancing the limited archives available for modelers concerning these parameters for Po and freshwater systems.
本文介绍了南美洲乌拉圭东海岸一个沿海泻湖不同区域中钋的含量及分布情况。通过在泻湖不同地点、在几次采样活动期间采集不同基质（如水、表层沉积物、蛤蜊（双齿蚌属）、淡水蜗牛（南美螺属）、浮游动物和鱼类（詹氏鱼属）），获得了钋的活度浓度。此外，还测定了沉积物中的有机质含量，以研究泻湖沿线钋的变化情况。水样中钋的活度浓度范围在1.1±0.2 - 3.5±0.4毫贝克勒尔/升之间，而沉积物样品中的活度浓度在17.1±1.4至540±12贝克勒尔/千克（干重）之间。对于生物群，蛤蜊的活度浓度范围为182±5 - 265±6贝克勒尔/千克（干重）；蜗牛样品中的活度浓度范围为134±4 - 1245±16贝克勒尔/千克（干重）。观察到钋与沉积物的有机组分具有良好的相关性（r = 0.8798，p值<0.001），分布系数Kd值较高（10 - 10）。在生物群样品中，观察到两种物种的钋浓度值存在明显差异，这主要是由于两种水生生物的摄食习惯不同，这在相关浓度比（CR）中有所体现。本文在不同基质中获得了一组关于钋、Kd和CR的良好结果，增加了建模人员可获取的有关钋和淡水系统这些参数的有限档案资料。
