SOMEȘUL MIC RIVER (CLUJ COUNTY, ROMANIA) WATER QUALITY ASSESSMENT UNDER ANTHROPOGENIC IMPACT
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Babeş-Bolyai University / Cluj University Press
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The quality of surface waters has an important role in the environmental context. Someșul Mic river quality, in the studied area, is influenced by the pollution resulted from Florești locality and Cluj-Napoca city. Were collected and analyzed 28 water samples from the course of the river, on a distance of 20 km crossing Cluj-Napoca city. The studied physico-chemical parameters were: pH, redox potential (Eh), electrical conductivity (EC), total dissolved solids (TDS) and salinity, using a WTW 350i multiparameter. The anions (F-, Cl-, Br-, NO3-, NO2-, SO42-, PO43-) and cations content (Li+, Na+, K+, NH4+, Ca2+, Mg2+) were analyzed using a IC 1500 Dionex Ion Cromatograph. The sampling was realized in two campaigns: Octomber 2018 and February 2019. According to the analyzed parameters, the quality of Someșul Mic River, in the investigated area, corresponds to a moderated water quality index (WQI = 64.94). In the investigated collection points, in three cases were identified high concentrations of nitrates (NO3-), above 5 mg/l. For most of the investigated parameters, the values measured in autumn 2018 were higher than those from spring 2019, one cause might be represented by the precipitations before October 2018, which brought a load of chemicals and contributed mainly to the higher nitrate values. The values of the analyzed parameters in spring 2019 tend to show an increasing trend from upstream to downstream.