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太湖流域典型湖泊表层沉积物中多环芳烃污染特征

Keywords: 太湖梅梁湾,天目湖,多环芳烃,表层沉积物

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Abstract:

持久性有机污染物引起的水质安全性问题日益受到广泛的关注,为了全面了解太湖流域湖泊沉积物中多环芳烃的污染特征,在太湖流域选择典型湖泊天目湖和太湖梅梁湾分别采集7个表层沉积物(0~2cm)样品,利用GC/MS分析了样品中16种优控多环芳烃(PAHs)。结果表明,天目湖表层沉积物中16种优控PAHs总量介于287.50~713.93ng·g-1(干质量),太湖梅梁湾表层沉积物中PAHs总量介于1690.72~5033.70ng·g-1(干质量),空间分布特征受周边区域内点源污染和河流输入污染物影响。天目湖表层沉积物TOC浓度与PAHs总量相关性比太湖梅梁湾显著。利用特征化合物指数对PAHs的来源进行判别,天目湖表层沉积物中PAHs主要来源是木材、煤燃烧,而太湖梅梁湾表层沉积物中PAHs主要来自石油、木材和煤燃烧混合来源。基于沉积物中多环芳烃的环境质量标准,太湖梅梁湾表层沉积物中PAHs生态风险远高于天目湖,但总体生态风险较低。

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