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Using the Shannon-Weaver index (H'), the link between the physical and chemical components of the biological component in the Bosnia River was examined. The results showed that pH and H' had a strong link (rs = 0.59), while total nitrogen and H' had a poor relationship (rs = 0.44), and COD-Cr had a weak relationship (rs = 0.34). KPK-Cr (I water class) had the lowest parameter concentrations, whereas electrical conductivity (IV-V water class) showed the highest. The values of the biological elements range from a poor 0.267 to a high state of 2.26. [ABSTRACT FROM AUTHOR]