A grid of 19 stations covering the whole area including point sources such as river outlets and towns. The gulf covers an area from 38° 51'00sN to 39° 10'00sN and from 20° 40'00sE to 21° 12'00sE

Ammonium and ammonia concentration parameters in water bodies; Dissolved oxygen parameters in the water column; Nitrate 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; Nitrite concentration parameters in 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

The nutrients and trace metal levels were studied in the waters of Amvrakikos Gulf throughout a period of 5 years. The samplings were carried out during the following months: October 1982, May 1983, July 1984, May 1985, July 1986. Water samples were collected using HYDRO-BIOS sampling bottles from surface and deeper waters (surface, 10m, 20m, 40m). Basic physicochemical data were measured in situ. Salinity was measured using a bench salinometer. Analyses on nutrients (NO3, NO2, NH4, PO4, SiO4) were carried out according to the standard photometric methods of Strickland and Parsons. The particulate phase was obtained after filtration through a 0.45 microweter Millipore membrane filter. The filters were then digested with conc. HNO3. The dissolved phase was preconcentrated on a CHELEX-100 resin and the metals were eluded with HNO3. Special care was taken to eliminate any contamination problems during analysis. 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 an 'historical' report as a time series per depth per station. Both these reports are stored as text files.

University of Athens, Department of Chemistry, Division of Inorganic and Environmental Chemistry, Environmental and Marine Chemistry Group
Panepistimiopolis
Athens

157 01
Greece