海南岛沿海牡蛎体中PAHs的时空分布及其健康风险评价

2009~2014年对海南岛沿岸近江牡蛎(Crassostrea rivularis)体中16种PAHs的污染水平、空间分布及趋势变化进行了研究.结果表明,海南岛沿岸牡蛎体中多环芳烃(PAHs)含量范围为289~2426ng/g d.w.,平均值为856.7ng/g d.w..与国内外相比,海南岛牡蛎体PAHs含量处于中等水平.海南岛牡蛎体PAHs含量表现出一定的空间差异,平均含量大小顺序为:八所港>榆林港>马袅港>东寨港. Mann-Kendall检验结果显示,八所港牡蛎体中PAHs含量有显著上升趋势(P0.05).组分分析结果显示,海南岛牡蛎主要以2~3环的低分子量PAHs为主(62.3%~92.5%).来源分析表明牡蛎体PAHs主要为石油源和油类燃烧源.风险评价结果显示,八所港牡蛎的PAHs致癌风险超过最大可接受致癌风险(10-5),但尚未达到严重的致癌风险(10-4),而其他站点牡蛎均处于可接受致癌风险水平.本研究建议居民对八所港牡蛎和海南其它牡蛎的日均消费量分别不超过56g和 67g.

Spatial-temporal distribution and health risk assessment of polycyclic aromatic hydrocarbons in oysters along the coast of Hainan Island

Levels, spatial and temporal trends of 16 polycyclic aromatic hydrocarbons (PAHs) in oyster Crassostrea rivularis along the Hainan Island coast were investigated from 2009 to 2014. Results showed that the total concentrations of PAHs in oysters ranged from 289 to 2426ng/g with an average of 856.7ng/g on a dry weight basis. The PAHs levels from Hainan Island coast fell within moderate levels compared with those from other coastal areas in the world. The average concentrations of PAHs exhibited definite spatial differences and decreased in the order : Basuo Harbor> Yulin Harbor> Maniao Harbor>Dongzhai Harbor. Based on Mann–Kendall test, only Basuo Harbor showed a significant increasing trend (P<0.05). The composition of PAHs was characterized by 2~3rings of PAHs (ranging from 62.3%~92.5%). PAHs may originate mainly from petroleum and combustion of oil. Risk assessment suggested that the cancer risks in oysters from Basuo Habor exceeded the maximum acceptable risk (10-5), but did not reach the serious cancer risk level (10-4), while the cancer risks in other sites were acceptable. Further assessment suggested that daily intake of edible oyster tissue from Basuo Habor and other areas of Hainan Island should not exceed 56g and 67g, respectively.