南澳海域龙须菜和篮子鱼重金属含量及食用安全分析

大型海藻龙须菜能吸收营养盐，改善养殖海区水质，同时还可被直接食用并作为鲍及篮子鱼等水生经济动物的饵料。为调查大型海藻和篮子鱼的食用风险，于2014年12月至2015年6月采集南澳岛深澳湾养殖海域龙须菜栽培区、鱼类养殖区、贝类养殖区、过渡区和对照海域不同功能区样品。结果显示，龙须菜能富集水中的重金属离子但不同季节富集能力（BCF）不同，富集能力最大值出现在5月份，分别为Cr（2.45×105）、Zn（1.67×105）、Pb（1.14×105）和Cd（0.16×105）。调查海域篮子鱼Cd（0.045×10-6～2.916×10-6），Cr（0.57×10-6～49.185×10-6）和Pb（0.12×10-6～1.452×10-6）含量均超过国家食品中污染物限量标准。龙须菜和篮子鱼非消化器官的生物放大因子（BMF）均较低，表明篮子鱼非消化器官对重金属的吸附主要来源于海水。研究结果表明，龙须菜和篮子鱼体内Cd、Cr和Pb含量分别超过了国家食品中污染物限量标准中的蔬菜和鱼类食用安全标准，因此，龙须菜及篮子鱼的食用安全应引起关注。

Heavy metals in Gracilaria lemaneiformis and Siganus oramin from Nan'ao,Guangdong, China and their edible safety

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.