Phase II Quality of water and sediment of the Schelde, the Leie, the Deule and the Spierre Spatial and Temporal Assessment of high Resolution Depth Profiles Using Novel Sampling Technologies VLIZ
Sampling expedition December 2003
Location of the sampling sites
Schelde: Helkijn
Schelde: Antoing
Schelde: Mortangne du Nord
Schelde: Vieux Condé
Schelde: Bruay sur Escaut
Samples taken Surface water: –Dissolved trace metals –Major ions –Suspended matter concentrations Sediments (bulk sediments) –Trace metals –Major ions –Organic matter
Dissolved metals
Dissolved trace metals
Dissolved metals
Dissolved trace metals
Sediments
Choice of future sampling stations for Phase II L’Escaut / Schelde : –Helkijn (station 5) –Bassin Rond (station 11) La Deûle / Deule : –Deulemont (station 14) –Metal Europe (station 19) La Lys / Leie : –Warneton (station 16) –Menen (station 18)
Timing of sampling March-April 2004: spring June-July 2004: summer September-October 2004: autumn December-January 2005: winter
Parameters to be analysed in Phase II First expedition: thorough characterisation of sediments –Porewaters: pH Redox Alcalinity DOC NO 3 -, NO 2 -, SO 4 2-, Cl, NH 4 +, PO 4 3- Dissolved S Fe 2+ Trace metals Hg speciation DGT/DET: trace metals, (Hg speciation),... –Sediments POC Hg/MMHg Trace metals/ major ions AVS/CRS Sequential extractions