Assessing the water quality of the Danube River (at Chiciu, Romania) by statistical methods

The aim of this article is twofold. Firstly, the water quality of the Lower Danube River is assessed using the data collected at three points at Chiciu km 375 (in Romania), during the period January 2010-December 2012 by computing the CCME Water Quality Index. Secondly, a similarity study for 17 series of water parameters recorded at the study sites is performed. CCME Water Quality Index, yearly computed, varied from Fair to Good, with an overall rating as Fair. Some dissimilarities of chemical oxygen demand, biochemical oxygen demand, N-NO4, N-total, Cu, Ni distributions are noticed.