Determination of the water quality and pollution level of Aksu Creek

This study, which has been carried out in order to determine some water quality parameters and the pollution level of the Aksu Creek which disembogue into Black Sea from the centre of Giresun, was started in January 2012. The water quality parameters; of dissolved oxygen, pH, temperature, salinity, total dissolved solids (TDS), conductivity, chlorophyll-a, oxidation reduction potential (ORP), biochemical oxygen demand (BOİ5), total alkalinity, total hardness, total ammonia nitrogen (TAN), ammonia, nitrite, nitrate, chloride, total phosphate, soluble reactive phosphorus (SRP), total suspended solids (TSS) were performed. Additionally, pH and organic matter contents were measured from sediment samples. The means obtained data were as fallow; dissolved oxygen; 9,85 mgL-1, pH; 7,47, temperature; 12,52°C, salinity; 0,14 ppt, TDS; 0,191 gL-1, conductivity; 290 mScm-1, ORP; -93,1 mV, BOİ5; 2,7 mgL-1, total alkalinity; 115,47 mgL-1, total hardness; 156,47 mgL-1, chlorophyll-a; 7,58 ugL-1, TAN; 0,73 mgL-1, ammonia; 0,002 mgL-1, nitrite; 0,011 mgL-1, nitrate; 1,354 mgL-1, chloride; 0,44 mgL-1, total phosphate; 0,672 mgL-1, SRP; 0,045 mgL-1, TSS; 2,954 gL-1. Obtained data showed that the water quality of Aksu Creek may suitable for agricultural activities and may be a suitable living habitat for the living beings and getting into the category of mild contaminated according it?s average total phosphate rate of 0,56 mgL-1 and nitrite rate of 0,011 mgL-1. The creek, however, may be classified as clean water and has no threat regarding to rest of the detected parameters. Key Words: Giresun, Aksu Creek, Water Quality, Pollution, Ammonia, Nitrate, Phosphate.