Heavy metals in Gracilaria lemaneiformis and Siganus oramin from Nan'ao,Guangdong,China and their edible safety
LUO Hong-tian, WANG Qing, SHEN Zhuo, YANG Yu-feng
Institute of Hydrobiology, Jinan University, Key Laboratory of Eutrophication and Red Tide Control, Education Department of Guangdong Province, Engineering Research Center for Tropical and Subtropical Aquatic Ecological Engineering, Ministry of Education, Guangzhou 510632, China
Abstract：Gracilaria lemaneiformis has the potential to remove excess of nutrients in coastal areas,and are of high economical value,such as food for human,fodder,and raw materials for agar industry.In the present study,samples were collected from five functional zones in Nan’ao island:G.lemaneiformis culture zone,fish culture zone,shellfish culture zone,transition zone and control zones from December,2014 to June,2015.Results showed that G.lemaneiformis had different adsorption capacities in different months.G.lemaneiformis showed the highest heavy metal bioconcentration factor(BCF) in May,2015,with the values of 2.45×105 for Cr,1.67×105 for Zn,1.14×105 for Pb and 0.16×105 for Cd,respectively.The heavy metal concentration of Cd(0.045×10-6 ~2.916×10-6 ), Cr(0.57×10-6 ~49.185×10-6 ) and Pb(0.12×10-6 ~1.452×10-6 ) in S.oramin exceeded the Chinese Food Standard.The biomagnification factors(BMF) was low in both G.lemaneiformis and non-digestive organs of S.oramin,which suggested that heavy metals in S.oramin were mainly absorbed from seawater.Results showed that the concentrations of Cd,Cr and Pb in G.lemaneiformis and S.oramin exceeded the Chinese vegetables and fish Food Standard,respectively.Therefore,more attentions should be paid on heavy metal concentrations and pollution in G.lemaneiformis and S.oramin.
LUO Hong-tian,WANG Qing,SHEN Zhuo et al. Heavy metals in Gracilaria lemaneiformis and Siganus oramin from Nan'ao,Guangdong,China and their edible safety[J]. Marine Environmental Science, 2018, 37(3): 362-368.
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