Abstract
Water quality criteria are all physicochemical and biological indicators that characterize a body of water. The current study aims at investigating the quality of two natural waters in the Gorj County sub-mountainous area (�u�i�a, Vaidei and Runc, capture Runc) used as drinking water sources of Targu-Jiu. Sampling and determinations use spectrophotometric, gravimetric, volumetric or electrometric techniques in accordance with standard methods (SR ISO and / or SR EN) for a series of physicochemical indicators analyzed between January - December 2017: thermal and acidification, oxygen regime, nutrients, salinity, relevant pollutants. Experimental values, annual averages related to the quality standards for potable water, ecological status and classification of water bodies, place the water of the two rivers in the drinking water category A1 and the first class of ecological quality. The Water Quality Index (WQI) for 9 selected parameters highlighted a sensitively close overall level of the water of the two rivers Susita (88) and Runc (85.2), the good quality category (7o-9o), reported to national quality standards for surface water which can be used for delivery as drinking water.The study of indicators of the two rivers in relation to national rules aligned with the European water requirements and research shows a high qualitative status corresponding to community uses.
Highlights
Water quality requirements vary depending on the demand for drinking water for human consumption or industrial water
By comparing the values of the physical-chemical quality indicators determined by the quality norms that must be met by the surface water used for potable wateraccording to GD no 567 of 2006), it is found that all the quality criteria of the parameters determined for the two rivers in the sub-Carpathian area, they are in the A1 category of water sources
The mean values of the analyzed indicators are sensitively close to the two rivers, where most of the concentrations are well below the limits set by quality standards (Table 2, column 8) or above the value of the quality standard at the dissolved oxygen saturation indicator with mean values 99.80% Șușița and 98.20% Runc, even with monthly 100% saturation values
Summary
Water quality requirements vary depending on the demand for drinking water for human consumption or industrial water.
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