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Tomas D.,Vodnogospodarski Laboratorij | Maldini K.,Vodnogospodarski Laboratorij | Matic N.,Vodnogospodarski Laboratorij | Rajcic M.M.,Vodnogospodarski Laboratorij
Hrvatske Vode | Year: 2013

The paper presents lake water quality as obtained by the application of the Water Quality Index (WQI), and its chemical composition as determined by the Piper diagram. The following lakes were investigated: Lake Vrana on the Cres island, Lake Vrana at Biograd na moru, Lake Crniševo of the Baćina Lakes, and the Butoniga reservoir in the period 2010-2012. When calculating the WQI, the following indicators were used: pH value, total dissolved solids (TDS), hydrogencarbonates, total hardness, chlorides, sulfates, nitrates, fluorides, calcium, magnesium, iron and manganese. For the WQI calculation, the drinking water recommendations of the World Health Organization (WHO) were applied, and the obtained WQI represents the suitability of water for use in water supply. The investigation determined that the water quality in Lake Vrana at Biograd n/m was of the lowest quality in 2012 (WQI=870), while the best water quality was recorded in in 2012 in Lake Vrana on the Cres island (WQI=31.2). According to the Piper diagram, the analysed lakes differ in their composition depending on the hydrological period, while Lake Vrana on the Cres island was of a uniform quality.

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