The lakes of Northern Greece
1988
Mourkidis, A.G. | Tsikritsis, E.G. (Aristotelion Univ., Thessaloniki, (Greece). Lab. of Agricultural Chemistry)
In a period of three years starting April 1983 and up to April 1985 several physicochemical parameters of the lake Koronia have been monitored at four sampling sites. Measurements of water temperature, dissolved oxygen content, pH, transparency, and conductivity were made in situ, while water samples transported to the laboratory were analyzed for chlorophyll, chlorides, sulphates nitrate nitrogen and total phosphorus. The water temperature ranged from 0.5 to 20 deg C dissolved oxygen from 58 to 160% of saturation, pH from 8.1 to 9.5, conductivity from 0.8 to 1.88 mS/cm, chlorides from 134 to 193 ppm, sulfates S from 18 to 24 ppm, transparency from 0.40 to 0.60 meters, chlorophyll from 32 to 48mg/m d(exp 3) (peak summer values), nitrate-nitrogen from 147 to 166 mg/m d(exp 3) (winter high values) and total phosphorus from 100mg/m d(exp 3) (winter value) to 170 mg/m d(exp 3) (summer value). According to our data lake Koronia is a shallow (3.9 m mean depth) eutrophic one with an external nutrient load coming from the municipal activities of the small town of Lagada and from soil erosion. The area has a population of 9,000 inhabitants and there is not any treatment of their sewage (1,2).
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