This paper presents the levels and distribution of ²¹⁰Po in different compartments of a coastal lagoon on the east coast of Uruguay (South America). Activity concentrations of ²¹⁰Po 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 ²¹⁰Po along the lagoon.

The activity concentrations of ²¹⁰Po 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 ²¹⁰Po 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 (10⁴ -10⁵). In the biota samples, a clear difference was observed in the ²¹⁰Po 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 ²¹⁰Po, Kd, and CR have been obtained in different matrices, enhancing the limited archives available for modelers concerning these parameters for ²¹⁰Po and freshwater systems.

本文介绍了乌拉圭（南美）东海岸沿海泻湖不同隔间中²¹⁰ Po的含量和分布。在不同的基质（例如水，浅表沉积物，蛤（Diplodon sp。），淡水蜗牛（Pomacea sp。），浮游动物和鱼类（Jenynsia sp。））中获得了²¹⁰ Po的活性浓度，这些基质在不同的点收集。泻湖和几次采样运动中。此外，确定沉积物的有机质含量以研究²¹⁰ Po沿泻湖的变化。

水样品中²¹⁰ Po的活度浓度范围在1.1±0.2–3.5±0.4 mBq / L之间，而沉积物样品中的活度浓度在17.1±1.4和540±12 Bq / kg DW之间变化。在生物群的情况下，蛤仔的DW为182±5–265±6 Bq / kg，蜗牛样品的DW为134±4–1245±16 Bq / kg。

观察到²¹⁰ Po与沉积物的有机组分具有良好的相关性（r = 0.8798，p值<0.001），这是分配系数Kd（10 ⁴ -10 ⁵）的高值。在生物区系样本中，两个物种的²¹⁰ Po浓度值均存在明显差异，这主要是由于两种水生生物的摄食习性不同所致，因为这反映在相关的浓度比（CR）中。

在本文中，已经在不同的矩阵中获得了²¹⁰ Po，Kd和CR的一组很好的结果，从而增强了建模人员可获得的关于²¹⁰ Po和淡水系统这些参数的有限档案。