The studied area covers the lake Mitrikou and its adjacent lagoons extending from 27.70° E to 25.21° E and from 40.53° N to 41.02° N. A total of 21 stations are sampled, 19 for water sampling and 12 for sediments.

Ammonium and ammonia concentration parameters in water bodies; Nitrate concentration parameters in the water column; Nitrite concentration parameters in the water column; Phosphate concentration parameters in the water column; Salinity of the water column; Silicate concentration parameters in the water column; Temperature of the water column; Alkalinity, acidity and pH of the water column; Dissolved trace metalloid and inorganic selenium concentrations in water bodies; Particulate trace metalloid and inorganic selenium concentrations in water bodies; Inorganic chemical composition of sediment or rocks

The aim of this project is to formulate an integrated proposal for a management plan of the area. Among other information some oceanographic data are needed for the purpose of this project. The parameters listed above are measured seasonally (4 times per year) either in situ (physicochemical parameters) or in surface water samples collected using HYDRO-BIOS sampling bottles. The sediments were collected using a Mackereth pneumatic minicorer. The cores obtained were 20cm deep and were sliced into subsamples 1 to 2 cm thickness. Analyses on nutrients (NO3, NO2, NH4, PO4, Porg., SiO4) were carried out according to the standard photometric methods of Strickland and Parsons. The trace metal particulate phase was obtained after filtration through a 0.45Gm Millipore membrane filter. The filters were then digested with conc. HNO3. The dissolved phase was pre-concentrated on a CHELEX-100 resin and the metals were eluded with HNO3 acid. Special care was taken to eliminate any contamination problems during analysis. The sediments were wet sieved through a 61Gm nylon net. Both fractions were digested with conc. HNO3 and measured for their total metal content. Trace metal concentrations were determined by using an Atomic Absorption Spectrophotometer. The data are stored on a DBase III Plus format with an index on sampling date, station and depth and can be processed in order to produce reports for each set of parameters (basic data, nutrients, each metal in dissolved and particulate phase) as a depth series per station per sampling date or 'historical' report as a time series per depth per station. Both these reports are stored as text files.

Hellenic Society for the Protection of the Environment and the Cultural Heritage
28 Tripodon Str. Plaka
Athens

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Greece