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海南岛沿岸牡蛎体内六六六的时空变化特征分析及风险评价

Keywords: 海南岛沿岸,牡蛎,六六六,时空变化,风险评价

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Abstract:

于2006—2011年间每年的3月份,在海南岛沿岸选取的4个重要港湾(马袅港、东寨港、八所港、榆林港)采集近江牡蛎(CrassostrearivularisGould)成体30只,用气相色谱法测定其六六六(HCHs,包括α-、β-、γ-、δ-HCH)含量。结果显示,2006—2011年近江牡蛎体中HCHs含量范围是未检出~1.16ng·g-1,平均含量是0.15ng·g-1,与1985年海南岛贝类体内的HCHs残留量相比,20多年间浓度降低至原来的1/45。在这6年中HCHs含量于2006—2008年先略微下降,之后小范围上下波动,但总体上呈平稳的趋势;样品中HCHs区域平均含量由高到低依次为马袅港>东寨港>八所港>榆林港。通过对HCHs的组分特征分析,认为海南岛采样海域周围近年没有新的HCHs污染源输入。与世界其他海域贝类体内HCHs含量比较,海南岛沿岸牡蛎体内HCHs残留量较低,符合中国《海洋生物质量》一类质量标准。通过计算安全消费量,认为海南岛沿岸海域牡蛎体内HCHs致癌风险和暴露风险均在可接受的范围之内。

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