Table 2.

Mean (±SD) metal concentrations (mg kg^-1 ww) measured in H. tubulosa and H. polii collected in the Gulf of Cagliari and maximum limit concentrations set by the European Commission (2006) seafood regulation.

	As	Cd	Cr	Cu	Hg	Ni	Pb
H. tubulosa (mg kg-1 ww)	2.2±0.5	0.002±0.001	0.07±0.03	0.41±0.08	0.005±0.002	0.04±0.01	0.05±0.01
H. polii (mg kg-1 ww)	3.7±0.7	0.005±0.001	0.13±0.05	0.50±0.11	0.004±0.001	0.08±0.02	0.15±0.07
EC (mg kg-1 ww)	-	1.0	-	-	0.5	-	1.5