Volume : 3, Issue : 7, JUL 2017

EVALUATION OF THE QUALITY OF SKADAR LAKE WATERS THROUGH THE DETERMINATION OF DISSOLVED OXYGEN AND BIOLOGICAL OXYGEN DEMAND

ALBANA TEMALI, ARIANA YLLI (KRAJA)

Abstract

Dissolved oxygen is the form of oxygen in water bodies available to acquatic plants and animals. The concentration of dissolved oxygen (DO) at 25°C under atmospheric pressure is 8.32 mg/l. The levels of dissolved oxygen arise from the interaction between the oxygen produced by photosynthesis, oxygen consumed by aerobic bacteria and the exchange of oxygen with atmosphere. Biological Demand of Oxygen (BOD) is the measure of the amount of oxygen needed by bacteria to oxidize the organic matter present in water sample over a period of 5 days. A healthy ecosystem has optimal values of dissolved oxygen. Lake Skadar situated on the Montenegro-Albanian border is one of the most interesting of Balkan lake Skadar lake has a number of intriguing feature such as the fishery associated with the cryptodepresssions, the tremendous fluctuations in water level and probable fluctuations in nutrient input. The low abundance of the phytoplankton, the axtensive areas of macrophytes suggest that the lake might be treated as if it were a littoral environment.During the study period (May-November 2014) was determined the levels of DO and NBO in six stations distributed in western and eastern shore of Skadar lake. The standart chemical method used to determine the amount of DO in water samples is the Winkler method. Based on the results the DO values ranged from 8.67-1.32 mg/l good sign of healthy waters. NBO ranged from 0.5-1.76 mg/l showing a low effect of urban pollutants toward the water of Shkodra Lake.

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