Changes in the Lower Drava River Water Quality Parameters Over 24 Years

Gvozdić, Vlatka; Brana, Josip; Puntarić, Dinko; Vidosavljević, Domagoj; Roland, Danijela

doi:10.2478/10004-1254-62-2011-2128

Abstract

The goal of this study was to analyse 13 physico-chemical and microbiological parameters of the Drava River water at three sampling sites in the lower Drava region (eastern Croatia) over two distinct periods: the pre-war period between 1985 and 1992 and the post-war period between 1993 and 2008. Over both periods, most parameters kept within the tolerable water quality limits, while NO₃-N, NH₄-N and BOD₅ were higher. The lower Drava showed slight organic pollution with high concentrations of dissolved oxygen. High levels of total coliforms and heterotrophic bacteria in the post-war period were only found downstream of the town of Osijek. Upstream of Osijek, the river showed a tendency for improvement.

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Changes in the Lower Drava River Water Quality Parameters Over 24 Years

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