The study deals with the application of cluster analysis (CA) and non-parametric tests (Shapiro–Wilk, Kruskal–Wallis, Dunn,
U Mann–Whitney) to classify and interpret of a monitoring data set for Odra River water quality assessment based on concentration
values of radiochemical parameters. The data set represents results for 3 alpha emitters (
210Po,
238U and
239+240Pu) measured in surface water samples collected at 13 different sampling locations (5 in major Odra stream while 8 in Odra
tributaries) within four seasons: winter, spring, summer and autumn, in the framework of 1 year-term quality monitoring research.
The correlation analysis of polonium, uranium and plutonium data indicates that significant values of Spearman’s correlation
coefficient appears between
210Po and
239+240Pu (
r = 0.55 in autumn and 0.77 in winter as well as 0.49 in all year), while statistical significant correlation between uranium
and plutonium as well as uranium and polonium were not found. In the Odra drainage basin, the biggest differences were observed
in the case of
238U. The hypothesis about possible geographic and seasonal differences between concentration of
210Po,
238U and
239+240Pu in the Odra River catchment area was verified by cluster analysis (CA). Finally, to asses if there are statistically significant
differences in mean concentration value of
210Po,
238U and
239+240Pu for Vistula and Odra Rivers drainage basins were obtained by used of the non-parametric tests. Comparing to Vistula catchment
area, statistically different concentration of
210Po and
239+240Pu in all year was observed for river samples collected on Odra drainage basin.
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