تراكم بعض المعادن النذرة في بعض أنواع الإسفنجيات في الشاطئ السوري

The aim of the present work is to test the value of some species of sponges living in Syrian coast as bio-indicators of trace metals contamination and compare results with concentration found in water. The concentrations of trace metals in sponges and water were determined in three sites distributed between Ras Al-bassit and Tartous coast. The concentration of metals in sponges ranged between ( 0.2 - 1.0 ) µg/g for Cd; Cu; Cr;Pb while it was less than 1.0 µg/l in sea water. As for the mercury, the concentrations were about 10 ng/g in sponges and in sea water they ranged between (10 – 120) ng/ l ; for zinc the concentrations were too high: they ranged between (40 – 180 ) µg/g in sponges and ( 5 -20 ) µg/l in sea water. Most results indicate the high capacity of sponges to accumulate trace elements form sea water; and the response of sponges to the changes of trace metals concentration was found to be significant between cleaner and clean area.