| To evaluate the contamination of Sn and Hg in the seafood in Yantai coastal areas,three kinds of wild shrimps and crabs were collected from three zones located in the coast in July,2009.At the same time,seven kinds of mollusks were purchased from the local market.The concentrations of Sn and Hg in the samples were analyzed using an Agilent 7500i inductively coupled plasma-mass spectrometer (ICP-MS).The results showed that Sn and Hg concentrations in all the samples were different,with the ranges of 0.375-0.570 mg·kg-1 and 0.060-0.340 mg·kg-1（d.w.）and the average values of 0.470 and 0.140 mg·kg-1,respectively.For the mollusk samples,Concha ostreae was highly enriched with Sn,with the value of 0.570 mg·kg-1,while Mytilus edulis was obviously enriched with Hg,with the value of 0.340 mg·kg-1.The value of Pi was 1.13,which indicated that Mytilus edulis was seriously polluted.The concentrations of Sn and Hg in Chamys farreri and Sol sricus were the lowest,respectively.For the collected samples,the average concentrations of Sn and Hg in Oratosquilla oratoria，Alpheus brevicristatus and Carpilius convexus in the background area were all lower than those in sewage outfall area and port area,the average concentrations of Sn were 0.520 mg·kg-1(port area)，0.470 mg·kg-1(sewage outfall area)and 0.290 mg·kg-1(background area)，the average concentrations of Hg were：0.160 mg·kg-1(port area)，0.157 mg·kg-1(sewage outfall area)and 0.137 mg·kg-1(background area).Compared with other reports,the Sn level in the studied marine organisms was moderate,but the Hg level was a little higher.However,the concentrations of Sn and Hg in the studied marine seafood were all below the limit for agriculture product safety requirements for non-environmental pollution products,except Hg in Mytilus edulis (the national standards of Sn haven't been established).The results suggested that the coastal areas studied were not significantly polluted by the heavy metals of Sn and Hg.However,from the view of human health,people should consume the seafood away from the sewage outfall area and port area. |
