نوع مقاله : یادداشت فنی (5 صفحه)
1 استادیار/گروه محیط زیست دانشکده منابع طبیعی و محیط زیست دانشگاه ملایر
2 دانشجوی کارشناسی ارشد/ محیط زیست، پردیس دانشکده کشاورزی و منابع طبیعی، دانشگاه تهران
عنوان مقاله [English]
Confidence of water quality is of prime importance before its use for drinking, agricultural, industrial or recreational purpose. The assessment of river water quality is an important element in the evaluation of water resources. The present study investigates the water quality of Aras River to provide an overview of the relationship and sources of physicochemical variables. A total of 20 samples were taken in the Aras River at 10 stations that 10 water samples were used for the analysis of heavy metals and 10 water samples for nitrate, nitrite, Na, Ca, K, pH, EC and TDS variables. Atomic Absorption Spectrophotometery, Spectrophotometer, Flame Photometer and pH and EC Meter were used for measuring of water quality variables. The results showed that the mean concentration of nitrate, nitrite, sodium, potassium, calcium, TDS in the Aras River were 297, 0.57, 67.3, 6.4, 57.4, 1014.73 mg/l respectively and for lead and cadmium 0.07, 0.61 µg/l. Also the mean value of electrical conductivity was 1254.3 µs/cm and the mean value of pH was 8.22. The concentration of nitrate, nitrite and electrical conductivity were higher than the WHO standard and other variables were less than or within the WHO standard. It seems that municipal wastewater and agricultural runoff are important factors affecting water quality.