太湖西岸沉积物中两种致嗅物质的分布特征

发布时间：2018-07-31 11:01

【摘要】：针对夏季太湖西岸近岸带沉积物中典型颗粒态致嗅物质:β-环柠檬醛、β-紫罗兰酮,进行研究分析.利用顶空固相微萃取的方法富集以及气质联用技术检测出太湖毛渎港近岸带沉积物中两种颗粒态致嗅物质.结果表明,其在沉积物表层含量最高,其中β-环柠檬醛含量达797.88ng/(g·dw),β-紫罗兰酮含量达1669.37ng/(g·dw),远远高出嗅阈值.空间分布上:在近岸带,表层沉积物(0-4cm)自然芦苇带内2种颗粒态致嗅物质的含量高于人工挖掘的漕沟内;近岸带嗅味物质明显高于湖区内.研究认为,藻类大量聚集死亡沉积至湖泊底部,降低沉积物的Eh,促进了致嗅物质的产生,为湖泛的暴发留下隐患.建议近岸带蓝藻聚集区适时打捞,底泥疏浚等生态治理措施,降低湖泛风险.
[Abstract]:The typical particulate odorous substances, 尾 -cyclic citral and 尾 -ionone, in the sediments of the coastal zone of the West Bank of Taihu Lake in summer were studied and analyzed. The results showed that the content of 尾 -Cyclocitral was the highest in the surface layer of sediment, and the content of 尾 -Cyclocitral reached 797.88ng/ (g dw), 尾 -ionone, which was much higher than the olfactory threshold of 1669.37ng/ (g dw),. Spatial distribution: in the coastal zone, the content of two particulate odorous substances in the surface sediment (0-4cm) natural Reed zone was higher than that in the artificially excavated channel, and the smelling substance in the coastal zone was obviously higher than that in the lake area. It is considered that a large number of algae accumulates and dies at the bottom of the lake, which reduces the Ehs of the sediments, promotes the production of olfactory substances, and leaves a hidden danger for the flooding of the lake. It is suggested that ecological control measures such as timely fishing and sediment dredging in the area of cyanobacteria accumulation in the coastal zone should be taken to reduce the risk of lake flooding.
【作者单位】：南京师范大学环境学院江苏省地理信息资源开发与利用协同创新中心江苏省环境演变与生态建设重点实验室;
【基金】：国家自然科学基金项目(41573061,41173078) 国家水体污染控制与治理科技重大专项(2012ZX07101-008-02) 江苏省太湖水环境治理专项基金(TH2014402)
【分类号】：X524

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